title: PHP understanding memory limit error
body: <p>I'm getting this error </p>
  
  <pre><code>Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 4194304 bytes)
  </code></pre>
  
  <p>How come he tried to allocate <code>4194304</code> (which is smaller than the limit he specifies <code>134217728</code>) and is exhausted?</p>