打开文件的功能

I have a code like this. but the problem is why can't output ... please give suggestions, what is wrong with this code

<?php

function randLine($fileName) {
    $fh = @fopen($fileName, "r");
    while (true) {
        $line = fgets($fh);
        if ($line == null) {
            break;
        }
    }
    fclose($fh);
    return $line;
}

$tes = randLine("list.txt");
$tes = str_replace(array("
", ""), "", $tes);
echo $tes;