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run code in 300+ PHP versions simultaneously
<?php foreach([ null, '', 'x', [0, 0, 'crop'], [0, 0, 123], [0, 0, null], [0, 0, '_foo'], ] as $size) { var_dump(($size[2][0] ?? null) === '_'); }
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(true)

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