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<?php $f = get_defined_functions(); echo implode("\n",preg_fiter('/^(is_)/','\1',$f['internal']));
based on Cq7dn
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function preg_fiter() in /in/YDKHH:3 Stack trace: #0 {main} thrown in /in/YDKHH on line 3
Process exited with code 255.
Output for 5.3.18 - 5.6.28
Fatal error: Call to undefined function preg_fiter() in /in/YDKHH on line 3
Process exited with code 255.