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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 42; var_dump( filter_var( $a, FILTER_SANITIZE_STRING ) );
based on isYXc
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(2) "42"