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run code in 300+ PHP versions simultaneously
<?php parse_str('a[b[c[test]]]', $out); var_dump($out);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.2, 5.1.4 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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) "" }

preferences:
215.3 ms | 401 KiB | 311 Q