php可以生成缩略图和水印图的类
用法：(1)改变图片大小
以下为引用的内容：
require_once('image.php');
$img = new Image('pic.jpg');
$img->changeSize(80,50);//改变尺寸
$img->creat();
$img->free();
(2)添加水印
以下为引用的内容：
require_once('image.php');
$img = new Image('pic.jpg');
$img->addWatermark('logo.jpg', 50);//添加水印，第一个参数是水印的图片地址，第二个参数是透明值
$img->create();
$img->
php可以生成缩略图和水印图的类
类的代码：以下为引用的内容：
<?php
class Image {
var $imageResource = NULL;
var $target = NULL;
var $enableTypes = array();
var $imageInfo = array();
var $createFunc = '';
var $imageType = NULL;
/**
* Construct for this class
*
* @param string $image
* @return Image
*/
function Image($image = NULL) {
//get enables
if(imagetypes() & IMG_GIF) {
$this->enableTypes[] = 'image/gif';
}
if(imagetypes() & IMG_JPEG) {
$this->enableTypes[] = 'image/jpeg';
}
if (imagetypes() & IMG_JPG) {
$this->enableTypes[] = 'image/jpg';
}
if(imagetypes() & IMG_PNG) {
$this->enableTypes[] = 'image/png';
}
//end get
if($image != NULL) {
$this->setImage($image);
}
}
/**
* set a image resource
*
* @param string $image
* @return boolean
*/
function setImage($image) {
if(file_exists($image) && is_file($image)) {
$this->imageInfo = getimagesize($image);
$img_mime = strtolower($this->imageInfo['mime']);
if(!in_array($img_mime, $this->enableTypes)) {
exit('系统不能操作这种图片类型.');
}
switch ($img_mime) {
case 'image/gif':
$link = imagecreatefromgif($image);
$this->createFunc = 'imagegif';
$this->imageType = 'gif';
break;
case 'image/jpeg':
case 'image/jpg':
$link = imagecreatefromjpeg($image);
$this->createFunc = 'imagejpeg';
$this->imageType = 'jpeg';
break;
case 'image/png':
$link = imagecreatefrompng($image);
$this->createFunc = 'imagepng';
$this->imageType = 'png';
break;
default:
$link = 'unknow';
$this->imageType = 'unknow';
break;
}
if($link !== 'unknow') {
$this->imageResource = $link;
} else {
exit('这种图片类型不能改变尺寸.');
}
unset($link);
return true;
} else {
return false;
}
}
/**
* set header
*
*/
function setHeader() {
switch ($this->imageType) {
case 'gif':
header('content-type:image/gif');
break;
case 'jpeg':
header('content-type:image/jpeg');
break;
case 'png':
header('content-type:image/png');
break;
default:
exit('Can not set header.');
break;
}
return true;
}
/**
* change the image size
*
* @param int $width
* @param int $height
* @return boolean
*/
function changeSize($width, $height = -1) {
if(!is_resource($this->imageResource)) {
exit('不能改变图片的尺寸,可能是你没有设置图片来源.');
}
$s_width = $this->imageInfo;
$s_height = $this->imageInfo;
$width = intval($width);
$height = intval($height);
if($width <= 0) exit('图片宽度必须大于零.');
if($height <= 0) {
$height = ($s_height / $s_width) * $width;
}
$this->target = imagecreatetruecolor($width, $height);
if(@imagecopyresized($this->target, $this->imageResource, 0, 0, 0, 0, $width, $height, $s_width, $s_height))
return true;
else
return false;
}
/**
* Add watermark
*
* @param string $image
* @param int $app
*/
function addWatermark($image, $app = 50) {
if(file_exists($image) && is_file($image)) {
$s_info = getimagesize($image);
} else {
exit($image . '文件不存在.');
}
$r_width = $s_info;
$r_height = $s_info;
if($r_width > $this->imageInfo) exit('水印图片必须小于目标图片');
if($r_height > $this->imageInfo) exit('水印图片必须小于目标图片');
switch ($s_info['mime']) {
case 'image/gif':
$resource = imagecreatefromgif($image);
break;
case 'image/jpeg':
case 'image/jpg':
$resource = imagecreatefromjpeg($image);
break;
case 'image/png':
$resource = imagecreatefrompng($image);
break;
default:
exit($s_info['mime'] .'类型不能作为水印来源.');
break;
}
$this->target = &$this->imageResource;
imagecopymerge($this->target, $resource, $this->imageInfo - $r_width - 5, $this->imageInfo - $r_height - 5, 0,0 ,$r_width, $r_height, $app);
imagedestroy($resource);
unset($resource);
}
/**
* create image
*
* @param string $name
* @return boolean
*/
function create($name = NULL) {
$function = $this->createFunc;
if($this->target != NULL && is_resource($this->target)) {
if($name != NULL) {
$function($this->target, $name);
} else {
$function($this->target);
}
return true;
} else if($this->imageResource != NULL && is_resource($this->imageResource)) {
if($name != NULL) {
$function($this->imageResource, $name);
} else {
$function($this->imageResource);
}
return true;
} else {
exit('不能创建图片,原因可能是没有设置图片来源.');
}
}
/**
* free resource
*
*/
function free() {
if(is_resource($this->imageResource)) {
@imagedestroy($this->imageResource);
}
if(is_resource($this->target)) {
@imagedestroy($this->target);
}
}
}
?>
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