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PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Runkit Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
runkit.superglobal | "" | PHP_INI_PERDIR |
runkit.internal_override | "0" | PHP_INI_SYSTEM |

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

`runkit.superglobal` string
  Comma-separated list of variable names to be treated as superglobals. This value should be set in the systemwide php.ini file, but may work in perdir configuration contexts depending on your SAPI.

  Example #1 Custom Superglobals with runkit.superglobal=_FOO,_BAR in php.ini

  `<?php
  function show_values() {
  echo "Foo is $_FOO\n";
  echo "Bar is $_BAR\n";
  echo "Baz is $_BAZ\n";
  }
  $_FOO = 'foo';
  $_BAR = 'bar';
  $_BAZ = 'baz';
  /* Displays foo and bar, but not baz */
  show_values();
  ?>`
`runkit.internal_override` boolean
  Enables ability to modify/rename/remove internal functions.

Installation
Resource Types
Installing/Configuring
PHP Manual