注意视频里写的两个info:
函数里的$info和$this->info是不同的变量

<?php

class Image{

private $image;

private $info;

public function __construct($src)

{

$info2 = getimagesize($src);

$this->info = array(

'width' => $info2[0],

'height' => $info2[1],

'type' => image_type_to_extension($info2['2'],false),

'mime' => $info2['mime']

);

$fun = "imagecreatefrom{$this->info['type']}";

$this->image = $fun($src);

}

public function thumb($width,$height)

{

$image_thumb = imagecreatetruecolor($width, $height);

imagecopyresampled($image_thumb, $this->image, 0, 0, 0, 0, $width, $height, $this->info['width'],$this->info['height']);

imagedestroy($this->image);

$this->image = $image_thumb;

}

public function show()

{

header("Content-type:".$this->info['mime']);

$funs = "image{$this->info['type']}";

$funs($this->image);

}

public function save($newimage)

{

$funs = "image{$this->info['type']}";

$funs($this->image,$newname.'.'.$this->info['type']);

}

public function __destruct()

{

imagedestroy($this->image);

}

}

?>

<title>给图片添加图片水印</title>

<?php

/*一、打开图片*/

$src = "001.png";

$info = getimagesize($src);

$type = image_type_to_extension($info[2],false);

$fun = "imagecreatefrom{$type}";

$image = $fun($src);

/*二、操作图片*/

$image_Mark = "logo.png";

$info2 = getimagesize($image_Mark);

$type2 = image_type_to_extension($info[2],false);

$fun2 = "imagecreatefrom{$type2}";

$water = $fun2($image_Mark);

//合并图片  0,0，$info[0],$info[1]将水印图片从原图的左上角顶点开始复制，0，0代表有多高复制多高，有多宽复制多宽。

imagecopymerge($image,$water,20,30,0,0,$info2[0],$info2[1],30);

imagedestroy($water);

/*三、输出图片*/

ob_clean();

header("content-type:".$info['mime']);

$funs = "image{$type}";

$funs($image);

$funs($image,"hi.".$type);  //保存图片

/*四、销毁图片*/

imagedestroy($image);

?>

teat.php

<?php 
    require "image_class.php";
    $src = '1.jpg';
    $image = new Image($src);
    $image->thumb(300,200);
    $image->show();

我的经过测试没有问题（代码如下）：

<?php 
//封装成类-压缩图片
class Image{	
    private $image;
    private $info;	
    //1.打开一张图片，读取到内存中	
    public function __construct($src){		
        $info = getimagesize($src);//获取图片信息放在$info里		
        $this->info = array(			
        'width' => $info[0],			
        'height' => $info[1],			
        'type' => image_type_to_extension($info[2],false),			
        'mime' => $info['mime']);		
        $fun = "imagecreatefrom{$this->info['type']}";		
        $this->image = $fun($src);	}	
        //2.操作图片(压缩)	
        public function thumb($width,$height){		
            $image_thumb = imagecreatetruecolor($width,$height);		
            imagecopyresampled($image_thumb,$this->image,0,0,0,0,$width,$height,$this->info['width'],$this->info['height']);		
            imagedestroy($this->image);		
            $this->image = $image_thumb;	
        }	
        //3.在浏览器中输出图片	
        public function show(){		
            header("Content-type:".$this->info['mime']);		
            $funs = "image{$this->info['type']}";		
            $funs($this->image);	
        }	
        //4.把图片保存到硬盘里	
        public function save($newname){		
            $funs = "image{$this->info['type']}";		
            $funs($this->image,$newname.'.'.$this->info['type']);	
        }	//5.销毁图片	
        public function __destruct(){		
                imagedestroy($this->image);	
        }
     }

笔记1

成功了，代码如下： header('Content-type:text/html;charset=utf8'); //打开图片 $pic_src='p02.jpg'; $pic_info=getimagesize($pic_src); $pic_type=image_type_to_extension($pic_info[2],false); $fun="imagecreatefrom{$pic_type}"; $image=$fun($pic_src); //操作图片 $font='msyh.ttf'; $content='您好，翌创'; $col=imagecolorallocatealpha($image,255,255,255,50); imagettftext($image,20,0,20,30,$col,$font,$content); //输出图片 header("Content-type:".$pic_info['mime']); $func="image{$pic_type}"; $func($image); //保存图片 $func($image,'images/new.'.$pic_type); //清理图片 imagedestory($images);

test.php <?php require "image.class.php"; $src = "image/test.jpg"; $image = new Image($src); $image->image_Thumb(300,200); $image->image_Show(); $image->image_Destroy(); ?>

image.class.php <?php /** * 图片工具类 */ class Image{ private $image; private $info; /** * 构造函数 */ public function __construct($src){ //获取图片信息 $info = getimagesize($src); $this->info = array( 'width' => $info[0], 'height' => $info[1], 'type' => image_type_to_extension($info[2],false), 'mime' => $info[3] ); //在内存中创建一个相同类型的图片 $new_cache = "imagecreatefrom{$this->info['type']}"; $this->image = $new_cache($src); }

/** * 操作图片 缩略图 */ public function image_Thumb($dstWidth,$dstHeight){ $image_thumb = imagecreatetruecolor($dstWidth,$dstHeight); imagecopyresampled($image_thumb,$this->image,0,0,0,0,$dstWidth,$dstHeight,$this->info['width'],$this->info['height']); //原始图片已使用完毕 可以销毁 imagedestroy($this->image); $this->image = $image_thumb; } /** * 显示图片 */ public function image_Show(){ header("content-type:".$this->info['mime']); $new_cache = "image{$this->info['type']}"; $new_cache($this->image); } /** * 销毁图片 */ public function image_Destroy(){ imagedestroy($this->image); } } ?>

<?php /*打开图片*/ //1.配置图片路径 $src_url = "image/GD_test.png"; //2.获取图片信息 $info = getimagesize($src_url); // echo "<pre>"; //print_r($info); //3.通过图片编号来确认图片类型，取消false参数获取值为 .png ; $type = image_type_to_extension($info[2],false); // print_r($type); //4.在内存中创建一个和打开图片类型一样的图像 $fun = "imagecreatefrom{$type}"; //相当于 $fun = imagecreatefrompng()； //5.把图片复制到内存中 $image = $fun($src_url); //相当于 imagecreatefrompng($src) /*操作图片*/ //1.设置字体路径 $font = "image/msyhl.ttc"; //2.填写水印内容 $content = "xiaoweiba.ml"; //3.设置字体颜色RGB值和透明度， //参数1：内存中的图片； 参数2：颜色； 参数3：透明度 //注意！！！ png图片无法正常渲染字体颜色！！！！ $col = imagecolorallocatealpha($image,0,0,0,15);

imagettftext($image,20,0,20,30,$col,$font,$content); /*输出图片*/ //1.浏览器输出 header("Content-type:".$info['mime']); $func = "image{$type}"; //如果是jpeg就调用 imagejpeg()方法，如果是peg就会调用imagepng()方法 $func($image); //2.保存图片 $func($image,'image/newimage.'.$type); //imagepng($image,'image/newimage.png'); //显示图片 //输出生成的图片，配置文件路径 $src_new = "image/newimage.png"; //无法直接输出图片，必须将图片复制到内存中。 $fun_new = imagecreatefrompng($src_new); //输出图片 imagepng($fun_new); // imagepng(imagecreatefrompng("image/newimage.png")); /*销毁图片*/ imagedestroy($image); imagedestroy($fun_new); ?>

/* 输出图片 */ public function show() { header("Content-type:".$this->info['mime']); $funs="image{$this->info['type']}"; $funs($this->image); } /* 保存图片 */ public function save($newImage) { $funs="image{$this->info['type']}"; $funs($this->image,$newImage.'.'.$this->info['type']); } /* 销毁图片 */ public function __destruct() { imagedestroy($this->image); } } ?>