bar.php

<?php

function bar ($n) {
        return implode('', array_pad(array(), $n, '#')) . implode('', array_pad(array(), 100 - $n, '-'));
}

array_map(function ($i) {
        printf('%3d%% [|%s|]', $i, bar($i));
        usleep(2000000);
        print "\r";
}, range(1, 100));

print "\n";

// From:
// =>   1% [|#---------------------------------------------------------------------------------------------------|]
// To:
// => 100% [|####################################################################################################|]