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run code in 300+ PHP versions simultaneously
<?php var_dump([urldecode(http_build_query(['foo'=>'bar', 'baz'=>'qux'],'',', ')), http_build_query(['foo'=>'bar', 'baz'=>'qux'],'',', ')]);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(2) { [0]=> string(16) "foo=bar, baz=qux" [1]=> string(16) "foo=bar, baz=qux" }

preferences:
182.44 ms | 404 KiB | 329 Q