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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);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 2 in /in/3EiMd on line 6 array(1) { [2]=> int(1) } array(1) { [2]=> int(1) }

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