02php vars op control etc

8/14/2019 02PHP Vars OP Control Etc

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GeshanManandhar.com 1

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Geshan ManandharGeshan Manandhar

Developer,Developer,Young Innovations Pvt. LimitedYoung Innovations Pvt. Limited

www.geshanmanandhar.comwww.geshanmanandhar.com

http://www.php.net


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Variables in PHPVariables in PHP

Boolean: It can be eitherBoolean: It can be either TRUETRUE oror FALSEFALSE..

Integer: The size of an integer is platform-Integer: The size of an integer is platform-

dependent, although a maximum value ofdependent, although a maximum value of

about two billion is the usual value.about two billion is the usual value.Float: The size of a float is platform-Float: The size of a float is platform-

dependent, although a maximum ofdependent, although a maximum of

~1.8e308 with a precision of roughly 14~1.8e308 with a precision of roughly 14decimal digits is a common valuedecimal digits is a common value


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Variable in PHPVariable in PHP

String: A string is series of characters.String: A string is series of characters.In PHP, a character is the same as aIn PHP, a character is the same as abyte, that is, there are exactly 256byte, that is, there are exactly 256

different characters possible.different characters possible.Array: An array in PHP is actually anArray: An array in PHP is actually an

ordered map. A map is a type thatordered map. A map is a type that

mapsmaps valuesvalues toto keyskeys.. $names[1] = Ram;$names[1] = Ram; $names[2] = Shyam;$names[2] = Shyam;


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Variables in PHPVariables in PHP

Objects: mainly have attributes andObjects: mainly have attributes andfunctions.functions.

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Naming variables in PHPNaming variables in PHP

Variables in PHP are represented by a dollar signVariables in PHP are represented by a dollar signfollowed by the name of the variable. The variablefollowed by the name of the variable. The variablename is case-sensitive.name is case-sensitive.

A valid variable name starts with a letter orA valid variable name starts with a letter or

underscore, followed by any number of letters,underscore, followed by any number of letters,numbers, or underscores.numbers, or underscores. $a_5=10; //valid$a_5=10; //valid

$#b = 20; //invalid$#b = 20; //invalid

Predefined Variables ($_SERVER, $_POST)Predefined Variables ($_SERVER, $_POST)


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ConstantConstant

You can define a constant by using the define()You can define a constant by using the define()-function. Once a constant is defined, it can never-function. Once a constant is defined, it can neverbe changed or undefined.be changed or undefined.

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Arithmetic OperatorsArithmetic Operators

See Program for more clarification:Day02\prog06_Operators.php


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Comparison OperatorsComparison Operators

See code of Day02\prog08_comparision_operators.php


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Increment DecrementIncrement Decrement

OperatorsOperators ++ and --++ and --

Code at Day02\prog09_inc_dec_operator.php


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Logical OperatorLogical Operator


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String OperatorString Operator

. used to concatenate strings. used to concatenate strings

.= used to append a string..= used to append a string.

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If-else if- elseIf-else if- else

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If-else if- else alternateIf-else if- else alternate

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Switch ExampleSwitch Example

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While LoopWhile Loop

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Do While LoopDo While Loop

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For Each loopFor Each loop

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PHP simple FunctionPHP simple Function

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Function with PHPFunction with PHPan examplean example

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The sum of andThe sum of and is is .=$added?>.


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Lets get rollingLets get rolling

Write a program that performs all arithmeticWrite a program that performs all arithmeticoperations with 3 variables.operations with 3 variables.

Get the month with date(F) function and if itsGet the month with date(F) function and if itsDecember and day date(d) is greater than 20December and day date(d) is greater than 20

and less than 26, print Merry Christmas.and less than 26, print Merry Christmas.Print multiplication table of 5 with for loop.Print multiplication table of 5 with for loop.

Use foreach loop for an array called names andUse foreach loop for an array called names andprint the names in the array with its keys.print the names in the array with its keys.


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Questions are welcomeQuestions are welcome

Thats why god gave us two eyes, two earsThats why god gave us two eyes, two earsbut only one mouth.but only one mouth.

02php vars op control etc

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