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<?php parse_str('a[b[c[test]]]', $out); var_dump($out);
Output for 4.3.0 - 5.1.2, 5.1.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["a"]=> array(1) { ["b[c[test"]=> string(0) "" } }
Output for 5.1.3
array(2) { ["a"]=> array(1) { ["b[c[test"]=> array(1) { [0]=> string(0) "" } } ["_"]=> string(0) "" }