title: Get the column of function call in php
body: <p>I want to be able to get the column of a function call in PHP.</p>
  
  <p>With <code>debug_backtrace()</code>, I can get the line of the function call, but I cannot get the column.</p>
  
  <p>What I want to do is to be able to distinguish two function calls on the same line.</p>
  
  <p>For instance:</p>
  
  <pre><code>function test() {
      //do something with the line/column of the called function.
  }
  
  test(); test(); //How to know whether it is the first or second test() which is called?
  </code></pre>