3v4l.org

run code in 200+ php & hhvm versions
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<?php echo urldecode("%255B%257BESPA%25D1A%2522%253A%25221%2522%257D%255D");
Output for 4.3.0 - 7.2.0
%5B%7BESPA%D1A%22%3A%221%22%7D%5D