3v4l.org

run code in 300+ PHP versions simultaneously
<?php function v1($value) { return implode(array_map(function($value) { return ucfirst($value); }, explode('_', $value))); } function v2($value) { return preg_replace_callback('/([A-Z])/', function($char) { return '_'.strtolower($char[1]); }, lcfirst($value)); } function v3($value){ return preg_replace('/_(.?)/e',"strtoupper('$1')",$value); } for($x = 0; $x < 10000; $x++){ $foo = v3('foo_bar_baz_bee'); if($x = 0) echo $foo; }
preferences:
34.09 ms | 402 KiB | 5 Q