3v4l.org

run code in 300+ PHP versions simultaneously
<?php function check($value) { if ($value != "") { echo 'is not an empty string'; } else if ($value == '') { echo 'is an empty string'; } else { echo 'something else'; } } foreach(array( '', 0, false, true, null, -1, array(), 1, '0', '1' ) as $value) { var_export($value); echo check($value), "\n\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
''is an empty string 0is not an empty string falseis an empty string trueis not an empty string NULLis an empty string -1is not an empty string array ( )is not an empty string 1is not an empty string '0'is not an empty string '1'is not an empty string
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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
''is an empty string 0is an empty string falseis an empty string trueis not an empty string NULLis an empty string -1is not an empty string array ( )is not an empty string 1is not an empty string '0'is not an empty string '1'is not an empty string
preferences:
237.1 ms | 405 KiB | 460 Q