title: The term "haystack" in the context of PHP
body: <p>There are a few PHP functions (such as <a href="http://php.net/strstr" rel="noreferrer">strstr</a>, <a href="http://php.net/strpos" rel="noreferrer">strpos</a> and <a href="http://php.net/strrchr" rel="noreferrer">strrchr</a>)  that accept 
  a parameter named <code>$haystack</code>. Where does this name come from?</p>
  
  <p><img src="https://i.stack.imgur.com/A6BsB.jpg" alt="enter image description here"></p>