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  Change PHP settings with Apache directives

  2012/01/02 | Permalink | Comment?

  Suppose you have to change some PHP settings for specific projects or directories. Well, you can do so using four useful Apache directives, directly in your Apache configuration files, or even in .htaccess files. To change the value of a boolean directive use the following Apache directive:

  php_flag [directive_name] on|off
  

  To set the value of a non-boolean directive you can use the following Apache directive:

  php_value [directive_name] [value]
  

  Last, you can also use the two following directives, which behaves like the previous two directives, respectively, with a small difference. When you set a value using these directives, you can’t override it in the .htaccess file. And obviously, you can’t use them in that file.

  php_admin_flag [directive_name] on|off
  php_admin_value [directive_name] [value]
  

  For example, if you want to alter the error reporting rules for a specific virtual host, just use something like this in the virtual host configuration:

  php_flag display_errors on
  # Equal to "E_ALL | E_DEPRECATED"
  php_value error_reporting 30719
  

  Finally, remember that you cannot use the various PHP constants. You must use the numerical codes in place of them. E.g. E_DEPRECATED is 8192. Note that you can’t add comments in the same line of the directive: put it before or after! Otherwise Apache will not start up!
  For computing the value of the combination of two or more constants (like in the example above), you can use a PHP script like the following one:

  <?php
  
  echo (E_ALL | E_DEPRECATED); # Prints 30719
  

  Enjoy!

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