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run code in 150+ php & hhvm versions
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<?php $v = "%f0%80%80%a7"; $v = urldecode($v); $v = addslashes($v); echo $v.": ".utf8_decode($v); ?>
Output for 5.2.15 - 5.2.17, 5.3.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
�: ?
Output for 4.3.0 - 5.2.14, 5.3.0 - 5.3.3
�: '