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<?php $mystring = "null"; $arr = get_defined_vars(); foreach($arr as $a) { echo in_array('mystring',$a['mystring']); }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "mystring" in /in/hFXol on line 5 Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /in/hFXol:5 Stack trace: #0 /in/hFXol(5): in_array('mystring', NULL) #1 {main} thrown in /in/hFXol on line 5
Process exited with code 255.

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