Simple php CLI script for replacing css background images with base64 encoded images

base64imagescss.php

<?php

/*
 * Simple php CLI script for replacing css background images with base64 encoded 
 * images.
 * 
 * Usage:
 * base64imagescss.php ../../your/path/in.css out.css
 * 
 * @author Martins Balodis
 * @link https://github.com/martinsbalodis
 */

if (count($argv) !== 3) {
	throw new Exception("Invalid arg count");
}

$css_in = file_get_contents($argv[1]);
$base_dir = dirname($argv[1]).'/';
$allowed_mimes = array('image/jpeg', 'image/png', 'image/gif', 'image/jpg');


$css_out = preg_replace_callback('#url\(([a-z0-9/_\.]+)\)#', function($matches) use($base_dir, $allowed_mimes) {

		$image_location = $base_dir . $matches[1];

		// check image exists
		if (!is_file($image_location)) {
			throw new Exception("Image not found - " . $image_location);
		}

		$imageinfo = getimagesize($image_location);

		if (!isset($imageinfo['mime'])) {
			throw new Exception("error when trying to load image info - " . $image_location);
		}

		// check image mime
		if (!in_array($imageinfo['mime'], $allowed_mimes)) {
			throw new exception("Invalid image mime - " . $imageinfo['mime'] . ', ' . $image_location);
		}

		return 'url(data:' . $imageinfo['mime'] . ';base64,' . base64_encode(file_get_contents($image_location)) . ')';
	}, $css_in);
	
file_put_contents($argv[2], $css_out);