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<?php $data[] = null; $data[] = 0; $data[] = 1; $data[] = true; $data[] = false; foreach($data as $value) { $result = is_null($value); echo "is_null ( ", var_export($value, true), " ) = ", var_export($result, true), " \n";}
Output for git.master, git.master_jit, rfc.property-hooks
is_null ( NULL ) = Fatal error: Uncaught Error: Call to undefined function  var_export() in /in/M2NWG:12 Stack trace: #0 {main} thrown in /in/M2NWG on line 12
Process exited with code 255.

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