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run code in 150+ php & hhvm versions
Bugs & Features
<?php if ( empty( $mystring ) ) { echo "empty\n"; // empty } if ( $mystring == null ) { echo "null\n"; // Notice …; null } if ( !isset( $mystring ) ) { // unset echo "unset\n"; }
Output for 5.0.4 - 7.1.0
empty Notice: Undefined variable: mystring in /in/CFctU on line 5 null unset
Output for 4.3.0 - 5.0.3
empty Notice: Undefined variable: mystring in /in/CFctU on line 5 null unset