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php 图片调整大小 封装类【转载】
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<?php
class ImageResize
{
private $image;
private $img_des;
private $image_type;
private $permissions;
private $compression; /**
* 构造函数
* @param string $img_src 源图片
* @param string $img_des 保存图片对象
* @param int $compression 压缩比率，范围0-100(0:压缩比最高，100：压缩比最低)
* @param null $permissions 改变文件模式
* mode 参数由 4 个数字组成：
* 第一个数字永远是 0
* 第二个数字规定所有者的权限
* 第二个数字规定所有者所属的用户组的权限
* 第四个数字规定其他所有人的权限
* 1 - 执行权限，2 - 写权限，4 - 读权限
*/
function __construct($img_src, $img_des = NULL, $compression = 75, $permissions = null)
{
$image_info = getimagesize($img_src); $this->img_des = $img_des;
$this->image_type = $image_info[2];
$this->compression = $compression;
$this->permissions = $permissions; if ($this->image_type == IMAGETYPE_JPEG) {
$this->image = ImageCreateFromJPEG($img_src);
} elseif ($this->image_type == IMAGETYPE_GIF) {
$this->image = ImageCreateFromGIF($img_src);
} elseif ($this->image_type == IMAGETYPE_PNG) {
$this->image = ImageCreateFromPNG($img_src);
}
} /**
* 保存图片
*/
function save()
{
if ($this->image_type == IMAGETYPE_JPEG) {
imagejpeg($this->image, $this->img_des, $this->compression);
} elseif ($this->image_type == IMAGETYPE_GIF) {
imagegif($this->image, $this->img_des);
} elseif ($this->image_type == IMAGETYPE_PNG) {
imagepng($this->image, $this->img_des);
} if ($this->permissions != null) {
chmod($this->image, $this->compression);
}
} /**
* 做为图片流直接输出
*/
function output()
{
if ($this->image_type == IMAGETYPE_JPEG) {
header('Content-Type: image/jpg');
imagejpeg($this->image);
} elseif ($this->image_type == IMAGETYPE_GIF) {
header('Content-Type: image/gif');
imagegif($this->image);
} elseif ($this->image_type == IMAGETYPE_PNG) {
header('Content-Type: image/png');
imagepng($this->image);
}
} /**
* 获取图片宽度
* @return int 图片宽度
*/
function getWidth()
{
return imagesx($this->image);
} /*
* 获取图片高度
* @return int 图片高度
*/
function getHeight()
{
return imagesy($this->image);
} /**
* 按照固定高度缩放图片
* @param $height 需要改变大小的高度
*/
function resizeToHeight($height)
{
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width, $height);
} /**
* 按照固定宽度缩放图片
* @param $width 指定宽度
*/
function resizeToWidth($width)
{
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width, $height);
} /**
* 等比缩放图片
* @param int $scale 缩放比例
*/
function scale($scale)
{
$width = $this->getWidth() * $scale / 100;
$height = $this->getheight() * $scale / 100;
$this->resize($width, $height);
} /**
* 指定宽度和高度缩放图片
* @param int $width 缩放宽度
* @param int $height 缩放高度
* @return 缩放后图片对象
*/
function resize($width, $height)
{
$new_image = imagecreatetruecolor($width, $height); if ($this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG) {
$current_transparent = imagecolortransparent($this->image);
if ($current_transparent != -1) {
$transparent_color = imagecolorsforindex($this->image, $current_transparent);
$current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
imagefill($new_image, 0, 0, $current_transparent);
imagecolortransparent($new_image, $current_transparent);
} elseif ($this->image_type == IMAGETYPE_PNG) {
imagealphablending($new_image, false);
$color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
imagefill($new_image, 0, 0, $color);
imagesavealpha($new_image, true);
}
} imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
} ?>
使用方法：
$image = new ImageResize($tmp_image_name, NULL, 100);
$image->output();
