PHP converts uppercase names to underline split naming _php tips

Sometimes you need to convert the upper case of a string to _+ lowercase, and you will encounter this problem when you name the variable, directly on the code:

$name = ' apppromozhongqiu2014activestatusselector ';

echo Cc_format ($name);
function Cc_format ($name) {
  $temp _array = Array ();
  For ($i =0 $i <strlen ($name); $i + +) {
    $ascii _code = Ord ($name [$i]);
    if ($ascii _code >= && $ascii _code <=) {
      if ($i = = 0) {
         $temp _array[] = chr ($ascii _code +);
      }else{
        $temp _array[] = ' _ '. Chr ($ascii _code +);
      }
    else{
      $temp _array[] = $name [$i];
    }
  }
  Return implode (", $temp _array);
}