$name="wang_yi_cheng";
$arr=explode("_", $name);
array_walk($arr,function(&$v){$v=ucwords($v);} );
$y= implode("", $arr);
print_r($y);
$name="wang_yi_cheng";
$arr=explode("_", $name);
array_walk($arr,function(&$v){$v=ucwords($v);} );
$y= implode("", $arr);
print_r($y);