<?php

function get_data_simple($source_file = 'source.txt')
{
    $file_size = filesize($source_file);
    $source_fh = fopen($source_file, 'r');

    do {
        fseek($source_fh, rand(0, $file_size - 1));
        fgets($source_fh);
        $result = fgets($source_fh);
    } while (!trim($result));

    fclose($source_fh);
    return $result;
}
$data = get_data_simple();