title: How to use default arguments in php
body: <p>I want to define a function <code>doSomething(arg1, arg2)</code> with default values to arg1=val and arg2=val</p>
  
  <p>When I write</p>
  
  <pre><code>function doSomething($arg1="value1", $arg2="value2"){
   // do something
  }
  </code></pre>
  
  <p>Is it possible now to call doSomething with default arg1 and arg2="new_value2" </p>