Strip text out from between two strings

strip.php

<?php
/***********************************************/
/* PHP Strip Function
/* http://darcyclarke.me/articles/development/strip-out-text-between-two-tags-in-a-string-php/
/*
/* Copyright 2016, Darcy Clarke
/* Do what you want license
/***********************************************/
function strip($startTag,$endTag,$text,$pos=0){
  if(!is_integer($pos)){
    $pos = false;
    return false;
  }
  $pos1 = strpos($text,$startTag,$pos);
  if(!is_integer($pos1)){
    $pos = false;
    return false;
  }
  $pos1 += strlen($startTag);
  $pos2 = strpos($text,$endTag,$pos1);
  if(!is_integer($pos2)){
    $pos = false;return false;
  }
  $res = substr($text,$pos1,$pos2-$pos1);
  $pos = $pos2 + strlen($endTag);
  return $res;
}
?>