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PHP

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

Revision as of 14:32, 20 June 2006

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

Contents

Installing PHP

PHP is available trougth the port-tree ...

# cd /usr/ports/lang/php5

... and the packages ...

# pkg_add -r php5

Using PHP

There are two ways to use PHP :

  • With apache, configured to make PHP to proceed .php files asked by the user.
  • As any any interpreter

PHP for dynamic websites

All the steps of Apache configuration are explained after PHP installation. You have to add these two lines to 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 restart

Now, you can try your installation by creating a file test.php:

<?
   phpinfo();
?>

Pointing that file with your web browser should show you your php settings.

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 :

 #!/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>

Make the file executable:

% chmod +x phpscript

Then, you can run it from the commandline.

% ./phpscript | lynx -stdin

In this case, we've piped to lynx, so that we can browse the nicely formatted result.

                                              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.

Or, we could have executed the command directly from the commandline:

% 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

Personal tools