PHP函数删除字符串中某些字符之间的所有字符

<?php$string = 'Some valid and <script>some invalid</script> text!';$out = delete_all_between('<script>', '</script>', $string);print($out);function delete_all_between($beginning, $end, $string) {  $beginningPos = strpos($string, $beginning);  $endPos = strpos($string, $end);  if ($beginningPos === false || $endPos === false) {    return $string;  }  $textToDelete = substr($string, $beginningPos, ($endPos + strlen($end)) - $beginningPos);  return delete_all_between($beginning, $end, str_replace($textToDelete, '', $string)); // recursion to ensure all occurrences are replaced}