- preg_replace: documentation ( source)
<?php
/*echo preg_replace_callback('/([a-z]+)(_[a-z]+)/', function($u)
{
var_dump($u);
return ucwords(str_replace('_', '', $u[1]));
}
, 'rob_tr_yuui');
*/
echo preg_replace('/([a-z]+)(_[a-z]+)/', '$1.$2', 'rob_tr_yuui');