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<?php echo md5(‘foo’).sha1('foo'); ?>
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant ‘foo’ - assumed '‘foo’' in /in/S2dU3 on line 3 375858a0fdc51d21d1a57edf858a78bb0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33