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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(htmlentities("%df", ENT_SUBSTITUTE));
Output for 5.4.0 - 7.2.0
string(3) "%df"
Output for 4.3.0 - 5.3.29
Notice: Use of undefined constant ENT_SUBSTITUTE - assumed 'ENT_SUBSTITUTE' in /in/gb5Qv on line 2 Warning: htmlentities() expects parameter 2 to be long, string given in /in/gb5Qv on line 2 NULL