3v4l.org

run code in 300+ PHP versions simultaneously
<?php $txt = "kkklla"; $char = count_chars($txt, 1); arsort($char); $chars = []; foreach ($char as $key => $val) { $chars[chr($key)] = $val; } var_dump($chars);
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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(3) { ["k"]=> int(3) ["l"]=> int(2) ["a"]=> int(1) }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(3) { ["k"]=> int(3) ["l"]=> int(2) ["a"]=> int(1) }

preferences:
161.94 ms | 402 KiB | 200 Q