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<?php $myarray['myuser-myform']['myfile']="test"; $parts = explode("-",key($myarray)); printf("%s",$parts['myuser-myform']['myfile']); ?>
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: myuser-myform in /in/pY29k on line 4
Output for 4.3.0 - 5.2.17
Notice: Undefined index: myuser-myform in /in/pY29k on line 4