Alanaktion/turtles.php

## turtles.php
<?php
/**
 * turtles.php
 *
 * Uses the c.xkcd.com API to get a list of all images within xkcd #1416 Pixels
 *
 * @author Alan Hardman <alan@phpizza.com>
 */

/**
 * Gets images immediately within a main image
 * @param  string $src
 * @return array
 */
function getImages($src) {
	$url = "http://c.xkcd.com/turtle/" . $src;
	$result = json_decode(file_get_contents($url));
	return $result->white + $result->black;
}

// Start with the turtles base image
$images = array("turtles");
$sources = array("turtles");

while(!empty($sources)) {
	// Go through each $sources image
	foreach($sources as $key=>$src) {
		$new = getImages($src);
		unset($sources[$key]);
		foreach($new as $i) {
			// Add image to $images and $sources if not already there
			if(!in_array($i, $images)) {
				$images[] = $i;
				$sources[] = $i;
				echo "http://imgs.xkcd.com/turtledown/", $i, "-tiled.png\n";
			}
		}
	}
}
	<?php
	/**
	* turtles.php
	*
	* Uses the c.xkcd.com API to get a list of all images within xkcd #1416 Pixels
	*
	* @author Alan Hardman <alan@phpizza.com>
	*/

	/**
	* Gets images immediately within a main image
	* @param string $src
	* @return array
	*/
	function getImages($src) {
	$url = "http://c.xkcd.com/turtle/" . $src;
	$result = json_decode(file_get_contents($url));
	return $result->white + $result->black;
	}

	// Start with the turtles base image
	$images = array("turtles");
	$sources = array("turtles");

	while(!empty($sources)) {
	// Go through each $sources image
	foreach($sources as $key=>$src) {
	$new = getImages($src);
	unset($sources[$key]);
	foreach($new as $i) {
	// Add image to $images and $sources if not already there
	if(!in_array($i, $images)) {
	$images[] = $i;
	$sources[] = $i;
	echo "http://imgs.xkcd.com/turtledown/", $i, "-tiled.png\n";
	}
	}
	}
	}