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<?php parse_str('blaat[test][]', $out); var_dump($out);
Output for 4.3.0 - 5.1.2, 5.1.4 - 7.1.0
array(1) { ["blaat"]=> array(1) { ["test"]=> array(1) { [0]=> string(0) "" } } }
Output for 5.1.3
array(2) { ["blaat"]=> array(1) { ["test"]=> array(1) { [0]=> string(0) "" } } ["_"]=> string(0) "" }