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<?php $a = new DateTime("2014-09-24"); $b = new DateTime("2014-09-24"); $c = $a; $d = []; $d[$a]++; $d[$b]++; $d[$c]++; ?>
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: Cannot access offset of type DateTime on array in /in/kZFga:7 Stack trace: #0 {main} thrown in /in/kZFga on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught TypeError: Illegal offset type in /in/kZFga:7 Stack trace: #0 {main} thrown in /in/kZFga on line 7
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Illegal offset type in /in/kZFga on line 7 Warning: Illegal offset type in /in/kZFga on line 8 Warning: Illegal offset type in /in/kZFga on line 9
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/kZFga on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/kZFga on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/kZFga on line 6
Process exited with code 255.

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