Batch image rename (.jpg) with PHP

bim

#!/usr/bin/env php

<?php

    /**
     * Finds and renames .jpg files in current directory with unique filenames (uuid)
     * Usage: ./bim
     */

    foreach (glob('*.jpg') as $file) {
        $uuid = guidv4(random_bytes(16));
        rename($file, "{$uuid}.jpg");
    }

    function guidv4($data)
    {
        assert(strlen($data) == 16);

        $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10

        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
?>