PHP convert array entries
<p>Hi I have such question.
I have a php array with 4 entries. And I need to create a CLASS task with them.</p>

<pre><code>$array=array('USER','username','other','test');
</code></pre>

<p>This I want to use to generate this</p>

<pre><code>    $array[0]::find_by_$array[1]($array[3]); 

it must look as    
    USER::find_by_username(test);
</code></pre>

<p>How I can convert the array values into this line ?
What is the correct syntax ?</p>
