3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = '123'; if ( is_string( $a ) ) echo var_export($x, true);
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: a in /in/bhR8f on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/bhR8f on line 4