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<?php parse_str('category=x&category=y', $repeated); parse_str('category[]=x&category[]=y', $bracketed); var_dump($repeated); var_dump($bracketed);
Output for 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
array(1) { ["category"]=> string(1) "y" } array(1) { ["category"]=> array(2) { [0]=> string(1) "x" [1]=> string(1) "y" } }

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29.46 ms | 1152 KiB | 7 Q