randomUnsplashPic.php

<?php

/*******************************************************
 * Author: Fabian Dennler <fabian.dennler@zli.ch>
 * Released: 2020.11.02
 *******************************************************
 * Checkliste der Anforderungen
 *  ✔️ Dateisystem verwenden (optional)
 *  ✔️ Typenfunktionen verwenden 
 *  ✔️ Reguläre Ausdrücke verwenden (optional)
 *  ✔️ UDF verwenden
 *  ✔️ Konstrukte zur Iteration und Selektion verwenden
 *******************************************************/

// Keywords of images to search
$keywords[] = "abstract";
$keywords[] = "pattern";

// Resolution of wallpaper image
$resolution = "1920x1080";

// Destination filename in same folder
$destination = "wotd.jpg";

/***** DO NOT CHANGE ANYTHING BELOW THIS LINE *****/

// Check if there are at least 2 keywords
if (count($keywords) <= 1) {
  notify("error", "Please provide at least 2 keywords");
  exit();
}

// Shuffley keywords and extract two of them
shuffle($keywords);
$rand_keys = array_rand($keywords, 2);
$search[] = $keywords[$rand_keys[0]];
$search[] = $keywords[$rand_keys[1]];

// Check if format of resolution is correct
$regex= '/(\d{1,4})x(\d{1,4})$/i';
if (!preg_match($regex, $resolution)) {
  notify("error", "Please provide a resolution like '800x600'");
  exit();
}

// Check if a filename was provided
if(empty($destination)) {
  notify("error", "Please provide a filename for storage");
  exit();
}

// Fetch a random image from unsplash
$base_url = "https://source.unsplash.com/random/";
$fetch_url = $base_url . $resolution . "/?" . implode(",", $search);
notify("info", sprintf("Fetching %s", $fetch_url));
$data = file_get_contents($fetch_url);
$image = imagecreatefromstring($data);

if ($image !== false) {
  if (imagesy($image) > 0) {
    file_put_contents($destination, $data);
    notify("info", sprintf("Saved Wallpaper to %s (%d x %d)", $destination, imagesx($image), imagesy($image)));
  } else {
    notify("error", "Something went terrible wrong!!!");
  }
  imagedestroy($image);
}

// Colorful CLI output
function notify($type, $message) {
  $output = "";
  $background['red']        = '41';
  $foreground['white']      = '1;37';
  $foreground['light_blue'] = '1;34'; 
  if ($type === "error") {
    $output .= "\033[" . $foreground['white'] . "m";
    $output .= "\033[" . $background['red'] . "m";
  } else {
    $output .= "\033[" . $foreground['light_blue'] . "m";
  }
  $output .= $message . "\033[0m";
  print $output . PHP_EOL;
}