3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = 0; // Evaluates to true because $var is empty if (empty($var)) { echo "$var is either 0, empty, or not set at all "; echo "<br />"; } // Evaluates as true because $var is set if (isset($var)) { echo "$var is set even though it is empty"; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
0 is either 0, empty, or not set at all <br />0 is set even though it is empty
preferences:
279.5 ms | 406 KiB | 373 Q