SmartImage For Codeigniter

1.在index.php添加一个ROOTPATH常量 define("ROOTPATH", str_replace("\\", "/", (realpath(dirname(__FILE__))).'/')) ;

注意：以下常量可以定义在index.php中，否则容易重复定义 define('MEMORY_TO_ALLOCATE', '100M'); define('DEFAULT_QUALITY', 90); define('DOCUMENT_ROOT', ROOTPATH); define('CURRENT_DIR', DOCUMENT_ROOT); define('CACHE_DIR_NAME', '/images/imagecache/'); define('CACHE_DIR', CURRENT_DIR . CACHE_DIR_NAME);

2.library/Custom_image.php // Smart Image Resizer 1.4.1

// Parameters need to be passed in through the URL's query string: // image absolute path of local image starting with "/" (e.g. /images/toast.jpg)

// width maximum width of final image in pixels (e.g. 700) // height maximum height of final image in pixels (e.g. 700) // color (optional) background hex color for filling transparent PNGs (e.g. 900 or 16a942)

// cropratio (optional) ratio of width to height to crop final image (e.g. 1:1 or 3:2)

// nocache (optional) does not read image from the cache // quality (optional, 0-100, default: 90) quality of output image

///////////////////// // EXAMPLES /////////////////////

// Resizing a JPEG: // src="/image.php/image-name.jpg?width=100&height=100&image=/path/to/image.jpg" alt="Don't forget your alt text" />

// Resizing and cropping a JPEG into a square: // src="/image.php/image-name.jpg?width=100&height=100&cropratio=1:1&image=/path/to/image.jpg" alt="Don't forget your alt text" />

// Matting a PNG with #990000: // src="/image.php/image-name.png?color=900&image=/path/to/image.png" alt="Don't forget your alt text" />

///////////////////// // CODE STARTS HERE /////////////////////

class Custom_image{ function create($get_image='',$get_width='',$get_height='',$get_cropratio='',$get_color='',$get_quality='',$get_nocache=''){

$CI =& get_instance(); $base_url = $CI->config->slash_item('base_url');

$base_url = preg_replace('/\/$/', '', $base_url); //去除最后的 '/'原因是，CI里设置路径都加入了'/'

if ($get_image == '') { header('HTTP/1.1 400 Bad Request'); return 'Error: no image was specified'; exit(); }

define('MEMORY_TO_ALLOCATE', '100M'); define('DEFAULT_QUALITY', 90); define('DOCUMENT_ROOT', ROOTPATH); define('CURRENT_DIR', DOCUMENT_ROOT); //define('CURRENT_DIR', dirname(__FILE__)); define('CACHE_DIR_NAME', '/images/imagecache/'); define('CACHE_DIR', CURRENT_DIR . CACHE_DIR_NAME);

// Images must be local files, so for convenience we strip the domain if it's there

$image = preg_replace('/^(s?f|ht)tps?:\/\/[^\/]+/i', '', (string) $get_image);

// For security, directories cannot contain ':', images cannot contain '..' or '<', and

// images must start with '/'

if ($image{0} != '/' || strpos(dirname($image), ':') || preg_match('/(\.\.|<|>)/', $image))

{ header('HTTP/1.1 400 Bad Request'); return 'Error: malformed image path. Image paths must begin with \'/\'';

exit(); }

// If the image doesn't exist, or we haven't been told what it is, there's nothing

// that we can do if (!$image) { header('HTTP/1.1 400 Bad Request'); return 'Error: no image was specified'; exit(); } // Strip the possible trailing slash off the document root $docRoot = preg_replace('/\/$/', '', DOCUMENT_ROOT);

if (!file_exists($docRoot . $image)) { header('HTTP/1.1 400 Bad Request'); //header('HTTP/1.1 404 Not Found'); return 'Error: image does not exist: ' . $docRoot . $image; exit(); }

// Get the size and MIME type of the requested image $size = GetImageSize($docRoot . $image); $mime = $size['mime'];

// Make sure that the requested file is actually an image if (substr($mime, 0, 6) != 'image/') { header('HTTP/1.1 400 Bad Request'); return 'Error: requested file is not an accepted type: ' . $docRoot . $image;

exit(); } $width = $size[0]; $height = $size[1];

$maxWidth = ($get_width !== '') ? (int) $get_width : 0; $maxHeight = ($get_height !== '') ? (int) $get_height : 0;

if ($get_color !== '') $color = preg_replace('/[^0-9a-fA-F]/', '', (string) $get_color);

else $color = FALSE;

// If either a max width or max height are not specified, we default to something

// large so the unspecified dimension isn't a constraint on our resized image.

// If neither are specified but the color is, we aren't going to be resizing at

// all, just coloring. if (!$maxWidth && $maxHeight) { $maxWidth = 99999999999999; }