3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = ['foo-test' => [1], '-' => [2], 'bar-test' => [3]]; uksort($a, function($x, $y) use (&$a) { echo "$x"; // if (!isset($a[$x])) { // throw new Exception("Key '{$x}' not found."); // } // if (!isset($a[$y])) { // throw new Exception("Key '{$y}' not found."); // } return $x < $y; });
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
foo-test Deprecated: uksort(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/LFTof on line 4 --foo-testbar-test
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
foo-test Deprecated: uksort(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/LFTof on line 15 --foo-testbar-test
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
foo-test-foo-test
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
-bar-testfoo-test Warning: uksort(): Array was modified by the user comparison function in /in/LFTof on line 15
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