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run code in 200+ php & hhvm versions
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<?php $a = ['p' => 22.0]; var_dump($a); var_dump(json_decode(json_encode($a)));
based on OK4Re
Output for 5.4.0 - 7.2.0
array(1) { ["p"]=> float(22) } object(stdClass)#1 (1) { ["p"]=> int(22) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/g5fja on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/g5fja on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/g5fja on line 4
Process exited with code 255.