(PHP 4 >= 4.2.0, PHP 5, PHP 7)
Set an Apache subprocess_env variable
bool apache_setenv ( string $variable, string $value [, bool $walk_to_top = false ] )
apache_setenv() sets the value of the Apache environment variable specified by variable.
Note:
When setting an Apache environment variable, the corresponding $_SERVER variable is not changed.
Parameters:
variable