PHP

2009-10-22T23:14:07Z

190.27.10.162: /* Installing PHP */

PHP is a recursive acronym for ''PHP Hypertext Preprocessor''. It is an interpreted script language commonly used for dynamic pages generation on webservers. It is generally installed side by side with the [[Apache]] web server, and [[MySQL]] or [[PostgreSQL]] as database management system.

Customs officer for examination. ,

==Using PHP==
There are two ways to use PHP :
* With apache: configure apache to use php to process .php files requested by the user.
* As a command interpreter: php can process scripts, or instructions typed at the commandline.

===PHP for dynamic websites===

All the steps of Apache configuration are explained after PHP installation. You have to add these two lines in httpd.conf:
AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps

You will probably also want to add ''index.php'' as a possible directory index:
DirectoryIndex index.html index.php

You have to restart Apache to have your changes effective. For example, if you use Apache 2:
/usr/local/etc/rc.d/apache2.sh restart

Now, you can try your installation by creating a file test.php in the /usr/local/www/data directory:
<?
phpinfo();
?>

Request test.php using your web browser, and if all is well it will show you your PHP configuration.

===Scripts in PHP===

If you have compiled PHP with the commandline interface, you can write scripts in PHP that can be used from the [[shell]]. This is very useful for ''quick and dirty'' hacks; especially if you want your output to be HTML. Put the PHP code in a file like this :
<pre>
#!/usr/local/bin/php
# phpscript
<html> <title>Defined Constants</title> <body>

<h1><? echo "Hello from PHP " .phpversion() ?></h1>
<pre><? print_r(get_defined_constants()) ?></pre>

</body></html>
</pre>

Make the file executable:
'''%''' chmod +x phpscript

Then, you can run it from the command line.

'''%''' ./phpscript | lynx -stdin
In this case, we've piped to <code>lynx</code>, so that we can browse the nicely formatted result.
<pre style="background-color:black; color:white">
Defined Constants (p1 of 154)

Hello from PHP 5.1.4

Array
(
[E_ERROR] => 1
[E_WARNING] => 2
[E_PARSE] => 4
[E_NOTICE] => 8
-- press space for more, use arrow keys to move, '?' for help, 'q' to quit.
</pre>

Or, we could have executed the command directly from the command line:
'''%''' php -r 'echo "Hello from PHP ". phpversion() . "\n"; print_r(get_defined_constants());'
Hello from PHP 5.1.4
Array
(
...

==PHP Website==
[http://www.php.net http://www.php.net]

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