The dummyimage download files to local

dummyimage.php

#!/usr/bin/env php
<?php
    /*
    The MIT License (MIT)
    Copyright (c) 2015 iiitum

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    Request a dummy image from <http://dummyimage.com>.
    usage: php dummyimage.php COUNT WIDTH HEIGHT
    */

    $path = __DIR__ . '/dummyimage';

    # http://stackoverflow.com/questions/5614530/generating-a-random-hex-color-code-with-php
    function color()
    {
        return strtolower(sprintf('#%06X', mt_rand(0, 0xFFFFFF)));
    }

    # http://www.jonasjohn.de/snippets/php/color-inverse.htm
    function color_inverse($color)
    {
        $color = str_replace('#', '', $color);
        if (strlen($color) != 6){ return '000000'; }
        $rgb = '';
        for ($x=0;$x<3;$x++){
            $c = 255 - hexdec(substr($color,(2*$x),2));
            $c = ($c < 0) ? 0 : dechex($c);
            $rgb .= (strlen($c) < 2) ? '0'.$c : $c;
        }
        return strtolower('#'.$rgb);
    }

    function linkimage ($width, $height)
    {
        $url = 'http://dummyimage.com/';

        $format = array('gif', 'jpg', 'png');
        $format = $format[array_rand($format)];
        $colors[0] = color();
        $colors[1] = color_inverse($colors[0]);
        $colors[0] = str_replace('#', '', $colors[0]);
        $colors[1] = str_replace('#', '', $colors[1]);

        return array(
            'filename' => $width . 'x' . $height . '-' . $colors[0] . '-' . $colors[1] . '.' . $format,
            'link' => $url . $width . 'x' . $height . '/' . $colors[0] . '/' . $colors[1] . '.' . $format
        );
    }

    function create($count, $width, $height)
    {
        if (!is_dir($GLOBALS['path'])) {
            mkdir($GLOBALS['path']);
        }

        for ($i = 1;$i <= $count;$i++) {
            $linkfile = linkimage($width, $height);
            @file_put_contents($GLOBALS['path'] . '/' . $linkfile['filename'], fopen($linkfile['link'], 'r'));

            echo "[$i] ". json_encode($linkfile) . "\n";
        }
    }

    $count = 20;
    $width = 600;
    $height = 600;

    if (isset($argv[1])){
        $count = $argv[1];
    }

    if (isset($argv[2])){
        $width = $argv[2];
    }

    if (isset($argv[3])){
        $height = $argv[3];
    }

    create($count, $width, $height);

How to use?

1. run command curl 'https://gist.githubusercontent.com/iiitum/077022e7d29f761d8b97/raw/eb29b39c8f902a63191ff4bcdd7c77c961625db6/dummyimage.php' -o 'dummyimage.php'
2. run command php dummyimage.php 20 800 800

Let's enjoy.