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<?php $myarray['myuser-myform']['myfile']="test"; printf('%s',key($myarray[0])); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 0 in /in/smR9v on line 3 Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, null given in /in/smR9v:3 Stack trace: #0 /in/smR9v(3): key(NULL) #1 {main} thrown in /in/smR9v on line 3
Process exited with code 255.

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