Encapsulation class for adding, compressing and cutting PHP image watermarks

　phpThe operation of picture files mainly uses GD library extension. When we frequently use php to operate images, we will naturally encapsulate many functions , otherwise we will write too much repeated code. When there are many functions related to pictures, we can consider sorting out these php functions, so we have the idea of ​​encapsulating them into classes. Then let’s take a look at how it is packaged below!

There are four main steps to operating a picture:

1. Open the picture

2. ##Operation Picture

3. Output picture

4. Destroy picture

　The three steps 1, 3, and 4 must be written every time, and they are almost the same every time. The only thing that really needs to be changed is the step of manipulating images. Manipulating pictures is often done through one or more main GD functions.

The four methods in the encapsulation class of this article are text watermark (imagettftext()), image watermark (imagecopymerge()), image compression, and image cutting (imagecopyresampled()). The other commonly used GD functions are not Repeat. Directly enter the code:

<?php  

class Image
{    
    private $info;    private $image;    public $type;    public function construct($src)
    {

        $this->info=getimagesize($src);
        $this->type=image_type_to_extension($this->info['2'],false);
        $fun="imagecreatefrom{$this->type}";
        $this->image=$fun($src);
    }    /**
     * 文字水印
     * @param  [type]  $font     字体
     * @param  [type]  $content  内容
     * @param  [type]  $size     文字大小
     * @param  [type]  $col      文字颜色（四元数组）
     * @param  array   $location 位置 
     * @param  integer $angle    倾斜角度
     * @return [type]           
     */
    public function fontMark($font,$content,$size,$col,$location,$angle=0){
        $col=imagecolorallocatealpha($this->image, $col['0'], $col['1'], $col['2'],$col['3']);

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

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

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

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

        $funn="image".$this->type;

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

         $funn="image".$this->type;

         $funn($this->image,$newname.'.'.$this->type);
     }     public function destruct(){
         imagedestroy($this->image);
     }

 } ?>

The above is all the content of this article. If you need other operations, you only need to add them to this class. That’s it~~

Related recommendations:

Detailed tutorial on how to use the GD library to complete the verification code effect in PHP

How to open the GD library in php?

php Use GD library to generate high-quality thumbnail image sample code

The above is the detailed content of Encapsulation class for adding, compressing and cutting PHP image watermarks. For more information, please follow other related articles on the PHP Chinese website!