mvThumb - Automatic Image Resizer

automatic-image-resizer.php

<?php
	/*
		# Dynamic Image Resize .htaccess
		RewriteCond %{REQUEST_URI} /resize/(\d+)x(\d+)/(.*)
		RewriteRule ^(.*)$ http://www.example.com/resize/index.php?width=%1&height=%2&file=%3 [L]
	 */
	// Example Usage: http://www.example.com/resize/300x300/graphics/00000001/path-to-product-image.jpg


	// Declare Variables
	$missing_path = '../mm5/themes/luxe/images/img_coming_soon.png';
	
	$source_file_name = file_exists('../'.$_GET['file']) ? '../'.$_GET['file'] : $missing_path;
	$source_file_modified = (file_exists($source_file_name)) ? filemtime($source_file_name) : 0;
	$source_ext = strtolower(array_pop(explode('.',$source_file_name)));

	$finfo = new finfo(FILEINFO_MIME_TYPE);
	$mime_type = $finfo->file($source_file_name);

	$allowed_mime_types = array('image/png', 'image/jpeg', 'image/gif');
	$is_allowed = array_search($mime_type, $allowed_mime_types);

	if( !$is_allowed ){
		$source_ext = 'png';
		$mime_type = 'image/png';
		$source_file_name = $missing_path;
		$source_file_modified = filemtime($source_file_name);
	}


	// Set a maximum height and width
	$width = ( isset($_GET['width']) && $_GET['width'] < 2000 ) ? $_GET['width'] : 100;
	$height = ( isset($_GET['height']) && $_GET['width'] < 2000 ) ? $_GET['height'] : 100;


	// New dimensions
	list($width_orig, $height_orig) = getimagesize($source_file_name);
	$ratio_orig = $width_orig / $height_orig;
	if ($width/$height > $ratio_orig) {
		$width = intval($height*$ratio_orig);
	} else {
		$height = intval($width/$ratio_orig);
	}


	// New File Name
	$pattern = '/(.*)(\.[a-z]{3,4})$/';
	$replacement = '$1_'.$width.'x'.$height.'$2';
	$new_file_name = preg_replace($pattern, $replacement, $source_file_name);
	$new_file_modified = (file_exists($new_file_name)) ? filemtime($new_file_name) : 0;


	// Resize/Resample
	if( !file_exists($new_file_name) || $source_file_modified > $new_file_modified ){
		$image_p = imagecreatetruecolor($width, $height);
		switch($mime_type){
			case 'image/png':
				$image = imagecreatefrompng($source_file_name);
				$image_p = imagecreatetruecolor($width, $height);

				// handle the alpha transparency stuff
				imagealphablending($image_p, false);
				imagesavealpha($image_p, true);
				$transparent = imagecolorallocatealpha($image_p, 255, 255, 255, 127);
				imagefilledrectangle($image_p, 0, 0, $width_orig, $height_orig, $transparent);

				imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
				imagepng($image_p, $new_file_name, 6);
				break;
			case 'image/gif':
				$image = imagecreatefromgif($source_file_name);
				imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
				imagegif($image_p, $new_file_name, 80);
				break;
			case 'image/jpeg':
				$image = imagecreatefromjpeg($source_file_name);
				imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
				imagejpeg($image_p, $new_file_name, 80);
				break;
		}
		imagedestroy($image_p);
	}


	// Output Image
	header('Content-Type: '.$mime_type);
	echo file_get_contents( $new_file_name );
?>