PHP封裝的圖片大小調整類
PHP封裝的一個圖片調整類，可以輸出圖片流或者保存圖片，支持等比的寬度、高度和寬高度同時調整。代碼如下：
代碼如下：
<?php
class ImageResize
{
private $image;
private $img_des;
private $image_type;
private $permissions;
private $compression;
/*
構造函數
@param string $img_src 源圖片
@param string $img_des 保存圖片對象
@param int $compression 壓縮比率，范圍0-100(0:壓縮比最高，100：壓縮比最低)
@param null $permissions 改變文件模式
mode 參數由 4 個數字組成：
第一個數字永遠是 0
第二個數字規定所有者的權限
第二個數字規定所有者所屬的用戶組的權限
第四個數字規定其他所有人的權限
1 - 執行權限，2 - 寫權限，4 - 讀權限
*/
function __construct($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);
}
}
/*
保存圖片
*/
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, $this->compression);
}
}
/*
做為圖片流直接輸出
*/
function output()
{
if ($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($this->image);
}
}
/*
獲取圖片寬度
@return int 圖片寬度
/
function getWidth()
{
return imagesx($this->image);
}
/
獲取圖片高度
@return int 圖片高度
/
function getHeight()
{
return imagesy($this->image);
}
/*
按照固定高度縮放圖片
@param $height 需要改變大小的高度
/
function resizeToHeight($height)
{
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width, $height);
}
/*
按照固定寬度縮放圖片
@param $width 指定寬度
/
function resizeToWidth($width)
{
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width, $height);
}
/*
等比縮放圖片
@param int $scale 縮放比例
/
function scale($scale)
{
$width = $this->getWidth() $scale / 100;
$height = $this->getheight() $scale / 100;
$this->resize($width, $height);
}
/*
指定寬度和高度縮放圖片
@param int $width 縮放寬度
@param int $height 縮放高度
@return 縮放后圖片對象
/
function resize($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;
}
}
?></pre>
使用：
$image = new ImageResize($tmp_image_name, NULL, 100);
$image->output();
來自：http://my.oschina.net/u/437511/blog/183055