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<?php $counts = array(); $item = 2; $counts[$item] = $counts[$item]++ ?? 1; var_dump($counts); $counts[$item] = $counts[$item]++ ?? 1; var_dump($counts);
based on 8qs1B
Output for 7.0.0 - 7.2.0
Notice: Undefined offset: 2 in /in/3EiMd on line 6 array(1) { [2]=> int(1) } array(1) { [2]=> int(1) }
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/3EiMd on line 6
Process exited with code 255.