PHP patch exec_dir

Progamming language PHP allows one to limit executing of external commands via configuration directive safe_mode. This directive should contain full path to a directory conatining programs which PHP script can run. If the script tries to execute a command not located in this directory, the command is not executed. This configuration directive is active only if safe mode is enabled, which means more and sometimes unwanted restrictions to users.

PHP has no known possibility to limit executing of external commands with disabled safe mode. Teherefore, here is a patch adding special directive exec_dir straightly into PHP. This directive is very similar to safe_mode_exec_dir, but safe mode has not to be enabled.

This patch limits executing commands via functions from the exec family, i. e. exec(), system() or popen().