Cutting string from left and right

<?php

function strltrim($string, $part) {

  $string = trim($string);

  if (substr($string, 0, strlen($part))==$part)

    return(substr($string, strlen($part)));

  else

   return $string;

}

  

function strrtrim($string, $part) {

  $string = trim($string);

  if (substr($string, -strlen($part))==$part)

    return(substr($string, 0, strlen($string)-strlen($part)));

  else

   return $string;

}

  

$myname = "John Miller";

  

echo strltrim($myname,"John ");  //result "Miller"

  

echo strrtrim($myname," Miller"); //result "John"

?>