php對圖片檔案的操作主要是利用GD庫擴充。當我們經(jīng)常利用php對圖片進行操作時，會自然封裝很多函數(shù)，否則會寫太多重複的程式碼。當有很多對圖片的相關函數(shù)的時候，我們可以考慮將這些函數(shù)也整理一下，因而有了封裝成類別的想法。

　　操作圖片主要歷經(jīng)四個步驟：

1. 打開圖片
2. 操作圖片
3. 輸出圖片
4. 銷毀圖片

??　?1,34三個步驟都差不多。真正需要變通的只有操作圖片的這一步驟了。操作圖片又往往透過1或多個主要的GD函數(shù)來完成。

　　本文封裝類別裡面的四種方法，文字浮水印（imagettftext()），圖片水?。╥magecopymerge()），圖片壓縮，圖片剪切(imagecopyresampled())，其餘的常用GD函數(shù)便不賘述。直接上碼：

<?<span>php 

</span><span>class</span><span> Image
{    
    </span><span>private</span><span> $info;

    </span><span>private</span><span> $image;
    </span><span>public</span><span> $type;
    </span><span>public</span><span> function __construct($src)
    {

        $</span><span>this</span>->info=<span>getimagesize($src);
        $</span><span>this</span>->type=image_type_to_extension($<span>this</span>->info[<span>'</span><span>2</span><span>'</span>],<span>false</span><span>);
        $fun</span>=<span>"</span><span>imagecreatefrom{$this->type}</span><span>"</span><span>;
        $</span><span>this</span>->image=<span>$fun($src);
    }
    </span><span>/*</span><span>*
     * 文字水印
     * @param  [type]  $font     字體
     * @param  [type]  $content  內(nèi)容
     * @param  [type]  $size     文字大小
     * @param  [type]  $col      文字顏色（四元數(shù)組）
     * @param  array   $location 位置 
     * @param  integer $angle    傾斜角度
     * @return [type]           
     </span><span>*/</span><span>public</span> function fontMark($font,$content,$size,$col,$location,$angle=<span>0</span><span>){
        $col</span>=imagecolorallocatealpha($<span>this</span>->image, $col[<span>'</span><span>0</span><span>'</span>], $col[<span>'</span><span>1</span><span>'</span>], $col[<span>'</span><span>2</span><span>'</span>],$col[<span>'</span><span>3</span><span>'</span><span>]);

        imagettftext($</span><span>this</span>->image, $size, $angle, $location[<span>'</span><span>0</span><span>'</span>], $location[<span>'</span><span>1</span><span>'</span><span>], $col,$font,$content);
    }
    
    </span><span>/*</span><span>*
     * 圖片水印
     * @param  [type] $imageMark 水印圖片地址
     * @param  [type] $dst       水印圖片在原圖片中的位置
     * @param  [type] $pct       透明度
     * @return [type]            
     </span><span>*/</span><span>public</span><span> function imageMark($imageMark,$dst,$pct){
        $info2</span>=<span>getimagesize($imageMark);
        $type</span>=image_type_to_extension($info2[<span>'</span><span>2</span><span>'</span>],<span>false</span><span>);
        $func2</span>=<span>"</span><span>imagecreatefrom</span><span>"</span><span>.$type;
        $water</span>=<span>$func2($imageMark);

        imagecopymerge($</span><span>this</span>->image, $water, $dst[<span>0</span>], $dst[<span>1</span>], <span>0</span>, <span>0</span>, $info2[<span>'</span><span>0</span><span>'</span>], $info2[<span>'</span><span>1</span><span>'</span><span>], $pct);
        imagedestroy($water);

    }
    </span><span>/*</span><span>*
     * 壓縮圖片
     * @param  [type] $thumbSize 壓縮圖片大小
     * @return [type]            [description]
     </span><span>*/</span><span>public</span><span> function thumb($thumbSize){
        $imageThumb</span>=imagecreatetruecolor($thumbSize[<span>0</span>], $thumbSize[<span>1</span><span>]);
        
        imagecopyresampled($imageThumb, $</span><span>this</span>->image, <span>0</span>, <span>0</span>, <span>0</span>, <span>0</span>, $thumbSize[<span>0</span>], $thumbSize[<span>1</span>], $<span>this</span>->info[<span>'</span><span>0</span><span>'</span>], $<span>this</span>->info[<span>'</span><span>1</span><span>'</span><span>]);
        imagedestroy($</span><span>this</span>-><span>image);
        $</span><span>this</span>->image=<span>$imageThumb;
    }
    </span><span>/*</span><span>*
    * 裁剪圖片
     * @param  [type] $cutSize  裁剪大小
     * @param  [type] $location 裁剪位置
     * @return [type]           [description]
     </span><span>*/</span><span>public</span><span> function cut($cutSize,$location){
         $imageCut</span>=imagecreatetruecolor($cutSize[<span>0</span>],$cutSize[<span>1</span><span>]);

         imagecopyresampled($imageCut, $</span><span>this</span>->image, <span>0</span>, <span>0</span>, $location[<span>0</span>], $location[<span>1</span>],$cutSize[<span>0</span>],$cutSize[<span>1</span>],$cutSize[<span>0</span>],$cutSize[<span>1</span><span>]);
         imagedestroy($</span><span>this</span>-><span>image);
         $</span><span>this</span>->image=<span>$imageCut;
     }
    </span><span>/*</span><span>*
     * 展現(xiàn)圖片
     * @return [type] [description]
     </span><span>*/</span><span>public</span><span> function show(){
        header(</span><span>"</span><span>content-type:</span><span>"</span>.$<span>this</span>->info[<span>'</span><span>mime</span><span>'</span><span>]);

        $funn</span>=<span>"</span><span>image</span><span>"</span>.$<span>this</span>-><span>type;

        $funn($</span><span>this</span>-><span>image);
    }
    </span><span>/*</span><span>*
     * 保存圖片
 * @param  [type] $newname 新圖片名
 * @return [type]          [description]
 </span><span>*/</span><span>public</span><span> function save($newname){
         header(</span><span>"</span><span>content-type:</span><span>"</span>.$<span>this</span>->info[<span>'</span><span>mime</span><span>'</span><span>]);

         $funn</span>=<span>"</span><span>image</span><span>"</span>.$<span>this</span>-><span>type;

         $funn($</span><span>this</span>->image,$newname.<span>'</span><span>.</span><span>'</span>.$<span>this</span>-><span>type);
     }
     </span><span>public</span><span> function __destruct(){
         imagedestroy($</span><span>this</span>-><span>image);
     }

 }

 </span>?>

　　如果還需要其他操作，只需要再往這個類別裡面添加就好啦~~

以上就介紹了php圖片水印添加，壓縮，剪切類別的封裝，包括了方面的內(nèi)容，希望對PHP教程有興趣的朋友有所幫助。