shell_exec() and exec() not working in PHP

Question

Like many others I have problem with shell_exec() function in PHP. I have safe mode disabled and disabled_functions deleted from php.ini.

If I run php script from te

Answer 1

Your command line (CLI) PHP might be using a different working directory and/or path than the CGI one. Try defining the working directory (containing the lp command) explicitly with chdir() before calling shell_exec().