3v4l.org

run code in 300+ PHP versions simultaneously
<?php $strings = [ "test string", "lado lomidze needs a solution", "I made some research and found 'good' answers here; they really helped me." ]; // if not already all lowercase, use strtolower() var_export(preg_replace_callback('/\w.?/', function ($m) { return ucfirst($m[0]); }, $strings));
Output for 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => 'TeSt StRiNg', 1 => 'LaDo LoMiDzE NeEdS A SoLuTiOn', 2 => 'I MaDe SoMe ReSeArCh AnD FoUnD \'GoOd\' AnSwErS HeRe; ThEy ReAlLy HeLpEd Me.', )
preferences:
146.57 ms | 408 KiB | 5 Q