php development with oracle pt 2

8/7/2019 PHP Development with Oracle Pt 2

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PHP Development with OracleBy Darun



Creating and Editing PHP Scripts

� There are a number of specialized PHP editors available,

including Oracles JDeveloper which can be configured with

a PHP extension.

� Many developers still prefer text editors, or editors with

modes that highlight code syntax and aid development.

� PHP scripts often have the file extension .php, butsometimes .phtml or .inc are also used.

� The web server can be configured to recognize the

extension(s) that you choose.



PHP Syntax Overview

� PHP scripts are enclosed in <?php and ?> tags.Lines are terminated with a semi-colon:

� Blocks of PHP code and HTML code may beinterleaved. The PHP code can also explicitly printHTML tags:



PHP Syntax Overview

� The output when running this script is:

� A browser would display it as:

� PHP strings can be enclosed in single or doublequotes:



PHP Syntax Overview

� Variable names are prefixed with a dollar sign.Things that look like variables inside a double-quoted string will be expanded:

� Strings and variables can also be concatenatedusing a period.

� Variables do not need types declared:

� Arrays can have numeric or associative indexes:



PHP Syntax Overview

� Strings and variables can be displayed with anecho or print statement. Formatted output with printf() is also possible.

� Code flow can be controlled with tests and loops.PHP also has a switch statement. The if/ elseif/ else

statements look like:



PHP Syntax Overview

� A traditional loop is:

� This prints the numbers 0 to 9, each on a new line.

The value of $i is incremented in each iteration.The loop stops when the test condition evaluatesto true. You can also loop with while or do whileconstructs.

� The foreach command is useful to iterate overarrays:

� This sets $v to each element of the array in turn.



PHP Syntax Overview

� A function may be defined:

� Functions may have variable numbers of

arguments. This function could be called using:

� Function calls may appear earlier than thefunction definition. Procedures use the samefunction keyword but do not have a return

statement.

� Sub-files can be included in PHP scripts with aninclude() or r equir e() statement.



PHP Syntax Overview

� A r equir e() will generate a fatal error if the script isnot found. The include_once() and r equir e_once()statements prevent multiple inclusions of a file.

� Comments are either single line:

� or multi-line:



Running PHP Scripts

� Values can be changed by editing php.ini or using the Zend

Core for Oracle console, and restarting the web server. Somevalues can also be changed within scripts by using theini_set() function.

� To connect to Oracle, some Oracle environment variables

need to be set before the web server starts.



Running PHP Scripts in a Browser

� PHP scripts are commonly run by loading them ina browser:

http:// l ocal host/myphpinfo.php

� If your PHP code is in a file

� The -h options gives the help text:

� Common options when first using PHP are --ini which displays the location of the php.ini file, and-i which displays the value of the php.ini settings.

R

unning Scripts with Command Line PHP



Debugging PHP Scripts

� If not using a specialized PHP editor, debuggingwill be an old-fashioned matter of using echo toprint variables and check code flow.

�The v ar _dump() function is useful for debuggingbecause it formats and prints complex variables:

� The output is:

� The formatting is apparent when using command-line PHP. In a browser, to prevent white space andnew lines coalescing, you will need to do:



END

php development with oracle pt 2

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