php图片缩放代码-按比例缩放或截取指定大小的缩略图非常好用的一个方法_PHP教程

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* function resize:

*

* = creates a resized image based on the max width

* specified as well as generates a thumbnail from

* a rectangle cut from the middle of the image.

*

* @dir = directory image is stored in

* @newdir = directory new image will be stored in

* @img = the image name

* @newimg = the image new name

* @max_w = the max width of the resized image

* @max_h = the max height of the resized image

* @th_x = The starting point of the x-coordinate

* @th_y = The starting point of the y-coordinate

* @th_w = the width of the thumbnail

* @th_h = the height of the thumbnail

* @cut = Whether to need cut out

* @center = whether cut from the middle of the image

*

**********************************************************/

function resize($dir, $newdir, $img, $newimg, $max_w, $max_h, $th_x = '', $th_y = '', $th_w = '', $th_h = '',$cut = FALSE,$center = FALSE)

{

// set destination directory

if (!$newdir) $newdir = $dir;

if (!$newimg) $newimg = $img;

// get original images width and height

list($or_w, $or_h, $or_t) = getimagesize($dir.$img);

switch($or_t){

// original image

case 1:

$or_image = imagecreatefromgif($dir.$img);

break;

case 2:

$or_image = imagecreatefromjpeg($dir.$img);

break;

case 3:

$or_image = imagecreatefrompng($dir.$img);

break;

default:

return '不支持的图像格式'; www.2cto.com

break;

}

// make sure image is a jpeg

// if ($or_t == 2) {

// obtain the image's ratio

// $ratio = ($or_h / $or_w);

$ratio = ($max_h / $max_w);

// original image

// $or_image = imagecreatefromjpeg($dir.$img);

// resize image?

if ($or_w > $max_w || $or_h > $max_h) {

// resize by height, then width (height dominant)

if ($max_h < $max_w) {

$rs_h = $max_h;

$rs_w = $rs_h / $ratio;

}

// resize by width, then height (width dominant)

else {

$rs_w = $max_w;

$rs_h = $ratio * $rs_w;

}

// copy old image to new image

$rs_image = imagecreatetruecolor($rs_w, $rs_h);

imagecopyresampled($rs_image, $or_image, 0, 0, 0, 0, $rs_w, $rs_h, $or_w, $or_h);

}

// image requires no resizing

else {

$rs_w = $or_w;

$rs_h = $or_h;

$rs_image = $or_image;

}

// generate resized image

DrawImage($rs_image, $newdir.$newimg,$or_t,100);

//裁剪生成指定的大小start-------------------

if ($cut){

$th_image = imagecreatetruecolor($th_w, $th_h);

// cut out a rectangle from the resized image and store in thumbnail

if ($center){

$new_w = (($rs_w / 2) - ($th_w / 2));

$new_h = (($rs_h / 2) - ($th_h / 2));

}else {

$new_w = $th_x;

$new_h = $th_y;

}

imagecopyresampled($th_image, $rs_image, 0, 0, $new_w, $new_h, $rs_w, $rs_h, $rs_w, $rs_h);

// generate thumbnail

DrawImage($th_image, $newdir.'th_'.$newimg,$or_t,100);

@ImageDestroy($th_image);

}

//生成指定的大小end-------------------

// return true;

//}

// Image type was not jpeg!

/* else {

return false;

} */

@ImageDestroy($rs_image);

}

/**

* @resource image

* @filename

* @quality

* @type

**/

function DrawImage($resource,$filename,$type,$quality){

switch($type){

// original image

case 1:

$or_image = imagegif($resource,$filename);

break;

case 2:

$or_image = imagejpeg($resource,$filename,$quality);

break;

case 3:

$or_image = imagepng($resource,$filename);

break;

}

}

摘自 aa705123123的专栏

http://www.bkjia.com/PHPjc/478491.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478491.htmlTechArticle/********************************************************** * function resize: * * = creates a resized image based on the max width * specified as well as generates a thumbnail fro...

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