3v4l.org

run code in 500+ PHP versions simultaneously
<?php function countUniqueCharacters(string $str): int { static $cache = []; if (key_exists($str, $cache)) { return $cache[$str]; } echo PHP_EOL . "*** doing the work ***"; return $cache[$str] = count( array_filter( count_chars($str, 1), fn($count) => $count === 1 ) ); } $tests = ['one', 'two', 'three', 'one', 'two']; foreach ($tests as $test) { echo PHP_EOL . "$test : " . countUniqueCharacters($test); }
Output for git.master_jit, rfc.property-hooks, git.master
*** doing the work *** one : 3 *** doing the work *** two : 3 *** doing the work *** three : 3 one : 3 two : 3

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
51.03 ms | 1283 KiB | 4 Q