Sets the value of an environment variable (original) (raw)

putenv

(PHP 4, PHP 5, PHP 7)

putenv — Sets the value of an environment variable

Description

putenv ( string $setting ) : bool

Setting certain environment variables may be a potential security breach. The safe_mode_allowed_env_vars directive contains a comma-delimited list of prefixes. In Safe Mode, the user may only alter environment variables whose names begin with the prefixes supplied by this directive. By default, users will only be able to set environment variables that begin with PHP_ (e.g.PHP_FOO=BAR). Note: if this directive is empty, PHP will let the user modify ANY environment variable!

The safe_mode_protected_env_vars directive contains a comma-delimited list of environment variables, that the end user won't be able to change using putenv(). These variables will be protected even if safe_mode_allowed_env_vars is set to allow to change them.

Parameters

setting

The setting, like "FOO=BAR"

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Setting an environment variable

<?php putenv("UNIQID=$uniqid"); ?>

Notes

Warning

The safe_mode_allowed_env_vars andsafe_mode_protected_env_vars directives only take effect when safe_mode is enabled.