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<?php $array = []; $array["b"] =& $array["a"]; $array["b"] = 1; var_dump($array); ?>
based on ZLJ0M
Output for 5.4.10 - 5.6.28, 7.1.0 - 7.2.0
array(2) { ["a"]=> &int(1) ["b"]=> &int(1) }
Output for 7.0.0 - 7.0.20
array(2) { ["b"]=> &int(1) ["a"]=> &int(1) }
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6ddES on line 2
Process exited with code 255.