unexpected T_USE, expecting '{'

<?php

$wordFrequencyArray = array();

function countWords($file) use($wordFrequencyArray) {  //error here
    /* get content of $filename in $content */
    $content = strtolower(file_get_contents($filename));

Here is a snippet of a code i am using.

I am getting error on the 3rd line. I have all the matching braces .What might be wrong?