title: php fastest way to search array of objects to find needle and index
body: <p><strong>PHP version: 5.3</strong></p>
  
  <p>In Wordpress, I have an array of all the posts in a category having this format.</p>
  
  <pre><code>array
    0 =&gt; 
        public 'ID' =&gt; int 360
        public 'post_title' =&gt; string 'Batman v Superman: Dawn of Justice' 
    1 =&gt; 
        public 'ID' =&gt; int 371
        public 'post_title' =&gt; string 'Star Wars: Episode VII - The Force Awakens'
  ... =&gt;
  </code></pre>
  
  <p>Knowing the 'post_title' of the current post, what is the most efficient way using "post_title" as a needle to search the array and find it's index?</p>