本文實例為大家分享了多功能php圖片處理類，供大家參考，具體內容如下
<?php
/**
* Image.class.php 圖像處理類
* @author Administrator
*
*/
class Image{
private $path='';
/**
* 構造方法
* @param unknown $path
*/
function __construct($path=''){
if (!empty($path)) {
$this->path=$path;
}
}
/**
+-----------------------------------------------
* 等比縮放函數
+-----------------------------------------------
* @param unknown $name 需處理圖片的名稱
* @param unknown $width 縮放後的寬度
* @param unknown $height 縮放後的高度
* @param string $thumb_prixs 縮放後的前綴名
* @return mixed $newname 返回的縮放後的文件名
*/
function thumb($name,$width,$height,$thumb_prixs='th_'){
//獲取圖片信息
$Info=$this->ImageInfo($name); //圖片的寬度，高度，類型
//獲取圖片資源，各種類型的圖片都可以創建資源，jpg,gif,png
$imagres=$this->Img_resouce($name, $Info);
//獲取計算圖片等比例之後的大小，
$size=$this->getNewSize($name,$width,$height,$Info);
//獲取新的圖片資源，處理透明背景
$newimg=$this->getImage($imagres,$size,$Info);
//另存為一個新的圖片，返回新的縮放後的圖片名稱
$newname=$this->SaveNewImage($newimg,$thumb_prixs.$name,$Info);
return $newname;
}
/**
+-----------------------------------------------------------------------
* 水印標記函數
+-----------------------------------------------------------------------
* @param unknown $backname 背景文件名
* @param unknown $watername 水印文件名
* @param number $waterpos 水印位置
* @param string $wa_prixs 水印前綴名
* @return boolean
*/
function waterMark($backname,$watername,$waterpos=0,$wa_prixs='wa_') {
if (file_exists($this->path.$backname) && file_exists($this->path.$watername)) {
$backinfo=$this->ImageInfo($backname);
$waterinfo=$this->ImageInfo($watername);
if(!$pos=$this->getPos($backinfo, $waterinfo, $waterpos)){
echo "水印圖片不應該比背景圖片小";
return false;
}
$backimg=$this->Img_resouce($backname, $backinfo);
$waterimg=$this->Img_resouce($watername, $waterinfo);
var_dump($backimg);exit();
$backimg=$this->CopyImage($backimg, $waterimg, $pos, $waterinfo);
$this->SaveNewImage($backimg, $wa_prixs.$backname, $backinfo);
}else{
echo "圖片或水印不存在";
return false;
}
}
/**
+-----------------------------------------------------------------------
* 獲取圖片信息函數
+-----------------------------------------------------------------------
* @param unknown $name
* @return unknown
*/
private function ImageInfo($img) {
$imageInfo=getimagesize($img);
if ($imageInfo!==false) {
$imageType=strtolower(substr(image_type_to_extension($imageInfo[2]),1));
$imageSize=filesize($img);
$Info=array(
"width" => $imageInfo[0],
"height" => $imageInfo[1],
"type" => $imageType,
"size" => $imageSize,
"mime" => $imageInfo['mime']
);
return $Info;
}else{
return false;
}
}
/**
+--------------------------------------------------------
* 創建原圖像格式函數
+--------------------------------------------------------
* @param unknown $name
* @param unknown $imaginfo
* @return boolean|resource
*/
private function Img_resouce($name,$imageinfo){
$iamgeres=$this->path.$name;
//var_dump($iamgeres);exit();
switch ($imageinfo['type']) {
case 'gif':
$img=imagecreatefromgif($name);
break;
case 'jpg':
$img=imagecreatefromjpeg($name);
break;
case 'png':
$img=imagecreatefrompng($name);
break;
}
return $img;
}
/**
+--------------------------------------------------
* 獲取等比縮放尺寸函數
+--------------------------------------------------
* @param unknown $name
* @param unknown $width
* @param unknown $height
* @param unknown $imaginfo
* @return Ambigous <unknown, number>
*/
private function getNewSize($name,$width,$height,$imaginfo){
$size['width']=$imaginfo['width'];
$size['height']=$imaginfo['height'];
if ($width<$imaginfo['width']) {
$size['width']=$width;
}
if ($height<$imaginfo['height']) {
$size['height']=$height;
}
//圖像等比例縮放算法
if ($imaginfo['width']*$size['width']>$imaginfo['height']*$size['height']) {
$size['height']=round($imaginfo['height']*$size['width']/$imaginfo['width']);
}else{
$size['width']=round($imaginfo['width']*$size['height']/$imaginfo['height']);
}
return $size;
}
private function getImage($imageres,$size,$imageinfo){
//新建一個真彩色圖像
$newimg=imagecreatetruecolor($size['width'], $size['height']);
//將某個顏色定義為透明色
$otsc=imagecolortransparent($imageres);
//獲取圖像的調色板的顏色數目
if ($otsc>=0&&$otsc<=imagecolorstotal($imageres)) {
//取得某索引的顏色
$stran=imagecolorsforindex($imageres, $otsc);
//為圖像分配顏色
$newt=imagecolorallocate($imageres, $stran['red'], $stran['green'], $stran['blue']);
//區域填充函數
imagefill($newimg, 0, 0, $newt);
//為圖像定義透明色
imagecolortransparent($newimg,$newt);
}
imagecopyresized($newimg, $imageres, 0, 0, 0, 0, $size['width'], $size['height'], $imageinfo['width'], $imageinfo['height']);
imagedestroy($imageres);
return $newimg;
}
/**
+----------------------------------------------
*保存圖像函數
+----------------------------------------------
* @param unknown $newimg
* @param unknown $newname
* @param unknown $imageinfo
* @return unknown
*/
private function SaveNewImage($newimg,$newname,$imageinfo){
switch ($imageinfo['type']){
case 1://gif
$result=imagegif($newimg,$this->path.$newname);
break;
case 2://jpg
$result=imagejpeg($newimg,$this->path.$newname);
break;
case 3://png
$result=imagepng($newimg,$this->path.$newname);
break;
}
imagedestroy($newimg);
return $newname;
}
/**
+-----------------------------------------------------------------
* 獲取水印位置函數
+-----------------------------------------------------------------
* @param unknown $backinfo 背景信息
* @param unknown $waterinfo 水印信息
* @param unknown $waterpos 水印位置
* @return boolean|multitype:number 返回坐標數組
*/
private function getPos($backinfo,$waterinfo,$waterpos) {
if ($backinfo['width']<$waterinfo['width']||$backinfo['height']<$waterinfo['height']) {
return false;
}
switch ($waterpos) {
case 1://左上角
$posX=0;
$posY=0;
break;
case 2://中上方
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=0;
break;
case 3://右上角
$posX=$backinfo['width']-$waterinfo['width'];
$posY=0;
break;
case 4://左中方
$posX=0;
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 5://正中間
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 6://右中方
$posX=$backinfo['width']-$waterinfo['width'];
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 7://底部靠左
$posX=0;
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 8://底部居中
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 9://底部靠右
$posX=$backinfo['width']-$waterinfo['width'];
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 0:
default :
$posX=rand(0,$backinfo['width']-$waterinfo['width']);
$posY=rand(0,$backinfo['height']-$waterinfo['height']);
break;
}
return array('posX'=>$posX,'posY'=>$posY);
}
/**
+-------------------------------------------------------------------
* 拷貝圖像
+-------------------------------------------------------------------
* @param unknown $backimg 背景資源
* @param unknown $waterimg 水印資源
* @param unknown $pos 水印位置
* @param unknown $waterinfo 水印信息
* @return unknown
*/
private function CopyImage($backimg,$waterimg,$pos,$waterinfo) {
imagecopy($backimg, $waterimg, $pos['posX'], $pos['posY'], 0, 0, $waterinfo['width'], $waterinfo['height']);
imagedestroy($waterimg);
return $backimg;
}
}
?>
以上就是本文的全部內容，希望對大家學習PHP程序設計有所幫助。
