A function that returns an array containing MNIST labels

loadMNISTLabels.php

<?php

    public function loadMNISTLabels($filename)
    {
        $fp = fopen($filename, 'rb');

        $array = unpack("N2", fread($fp, 8));
        $magic = $array[1];

        if($magic != 2049) {
            throw new Exception("Bad magic number in $filename", 1);
        }

        $numLabels = $array[2];

        $stream = stream_get_contents($fp);

        $labels = unpack("C$numLabels", $stream);

        fclose($fp);

        return array_values($labels);
    }