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run code in 150+ php & hhvm versions
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<?php echo rawurlencode('{"5":"128","p":1}');
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
%7B%225%22%3A%22128%22%2C%22p%22%3A1%7D