<?php $data = `xdpyinfo`; $data = explode(PHP_EOL, $data); array_walk($data, function($val, $key) { $val = trim($val); if (strncmp($val, 'dimensions:', 11) == 0) { $val = array_values(array_filter(explode(' ', $val))); echo $val[1], PHP_EOL; } }); ?>