Save images from clipboard with tinymce

save_images.php

<?php

function save_images($object_id, $string, $overwrite=false) {
	if (!function_exists('imagecreatefromstring')) {
		throw new \Exception("This script requires the imagecreatefromstring function from the GD extension (http://www.php.net/manual/en/book.image.php).");
	}
	
	// This part could probably be better
	$types = array(
			'image/jpeg' => 'jpg',
			'image/png'  => 'png',
			'image/gif'  => 'gif',
		);
	$DOM = new DOMDocument;
	$DOM->loadHTML($string);
	// Find all the img tags
	$items = $DOM->getElementsByTagName('img');
	
	$usedFilenames = array();
	
	for ($i = 0; $i < $items->length; $i++) {
		$src = $items->item($i)->getAttribute('src');
		$alt = $items->item($i)->getAttribute('alt');
		// Only the ones with data: urls
		if (preg_match('/^data:/',$src)) {
			// Deconstruct it, get all the parts
			$semicolon_place = strpos($src, ';');
			$comma_place = strpos($src, ',');
			$type = substr($src,5,$semicolon_place-5);
			$base64_data = substr($src, $comma_place+1);
			$data = base64_decode($base64_data);
			$md5 = md5($data);
			$path = __DIR__."/saved/$object_id";
			if (!file_exists($path)) {
				mkdir($path, 0775);
			}
			
			if (empty($alt)) $filename = $md5;
			else $filename = urlencode(str_replace(' ', '_', strtolower(substr($alt, 0, 30))));
			if (in_array($filename, $usedFilenames)) {
				$filename .= '_'.$md5;
			}
			$usedFilenames[] = $filename;
			
			//convert image to JPG
			$imgDataFromClipboard = imagecreatefromstring($data);
			if ($imgDataFromClipboard) {
				$path .= "/{$filename}.jpg";
				
				//save as JPG
				if ($overwrite || !file_exists($path)) {
					imagejpeg($imgDataFromClipboard, $path, 90); //90% quality
				}
			}
			else {
				throw new \Exception("Error retrieving image data");
			}

			$items->item($i)->setAttribute('src', "{$object_id}/{$filename}.jpg");
		}
	}
	$string = $DOM->saveHTML();
	return $string;
}