title: what is behind array_unique function in php?
body: <p>Before asking this question,<br>
  I explored more but didn't get satisfying result.  </p>
  
  <p>People usually ask related to their problems in array_unique function. But, here
  i want to know  </p>
  
  <p>how <strong>array_unique</strong> function works in php? And where can i see the inbuilt function definition?</p>