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Introduction to IteratorsDebug Session
Marcus Börger
LinuxTag 2004 Karlsruhe
Marcus Börger Introduction to Iterators 2
An example<?php
class ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 3
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 4
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 5
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 6
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 7
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 8
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 9
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 10
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 11
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 12
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 13
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 14
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 15
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 16
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 17
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 18
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 19
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 20
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 21
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 22
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 23
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 24
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
Marcus Börger Introduction to Iterators 25
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 26
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 27
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 28
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 29
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 30
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 31
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 32
An example<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
Marcus Börger Introduction to Iterators 33
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 34
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 35
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 36
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 37
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 38
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 39
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 40
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 41
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 42
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 1
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 43
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 44
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 45
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 46
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 47
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 48
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 49
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 50
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 51
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 52
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 53
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 54
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 55
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 56
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 57
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 58
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 59
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 60
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 2
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 61
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 62
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 63
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 64
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 65
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 66
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 67
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 68
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 69
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 70
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
Marcus Börger Introduction to Iterators 71
An example<?php$a = array(1, 2, 3);$o = new ArrayIterator($a);foreach($o as $key => $val) {
echo "$key => $va\n";}?>
0 => 11 => 22 => 3
<?phpclass ArrayIterator extends Iterator {
protected $ar;function __construct(Array $ar) {
$this->ar = $ar;}function rewind() {
rewind($this->ar);}function valid() {
return !is_null(key($this->ar));}function key() {
return key($this->ar);}function current() {
return current($this->ar);}function next() {
next($this->ar);}
}?>
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