3v4l.org

run code in 150+ php & hhvm versions
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<?php $input = array( 'AND' => 1, 'OR' => 2 ); echo '"', current( array_keys( $input ) ), '"';
Output for 4.3.0 - 5.0.4, 5.1.0 - 7.1.0
"AND"
Output for 5.0.5
" Fatal error: Only variables can be passed by reference in /in/IL5GD on line 3
Process exited with code 255.