本文实例讲述了PHP开发的文字水印，缩略图，图片水印实现类与用法。分享给大家供大家参考，具体如下：

1.实现类ImageToTest.class.php参考代码

class ImageToTest {

/**

* 图片的基本信息

*/

private $info;

private $image;

public function __construct($src){

$info = getimagesize($src);

$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);

}

/**

* 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;

}

/**

* 操作图片(添加文字水印)

*/

public function fontMark($content,$font_url,$size,$color,$local,$angle){

$col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]);

imagettftext($this->image,$size,$angle,$local['x'],$local['y'],$col,$font_url,$content);

}

/**

* 操作图片(添加水印图片)

*/

public function imageMark($source,$local,$alpha){

//1.获取水印图片的基本信息

$info2 = getimagesize($source);

//2.通过水印的图片编号来获取水印的图片类型

$type2 = image_type_to_extension($info2[2],false);

//3.在内存中创建一个和我们的水印图像一致的图像类型

$func2 = "imagecreatefrom{$type2}";

//4.把水印图片复制到内存中

$water = $func2($source);

//5.合并图片

imagecopymerge($this->image,$water,$local['x'],$local['y'],0,0,$info2[0],$info2[1],$alpha);

//6.销毁水印图片

imagedestroy($water);

}

/**

* 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);

}

/**

* 把图片保存到硬盘里

*/

public function save($newName){

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

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

}

/**

* 销毁图片 使用析构函数

*/

public function __destruct()

{

imagedestroy($this->image);

}

}

2.测试参考代码

require_once('ImageToTest.class.php');

/*$src = './image/wbg.jpg';

$image = new ImageToTest($src);

$image->thumb(700,550);

$image->show();*/

/*$src2 = './image/wbg.jpg';

$content = 'SGC';

$font_url = './image/YGYcuhei.ttf';

$size = 33;

$color = array(

0=>2,

1=>222,

2=>222,

3=>60

);

$local = array(

'x'=>20,

'y'=>100

);

$angle = 10;

$image2 = new ImageToTest($src2);

$image2->fontMark($content,$font_url,$size,$color,$local,$angle);

$image2->show();

$image2->save('hahahah');*/

$src3 = './image/wbg.jpg';

$source = './image/water.jpg';

$local = array(

'x'=>20,

'y'=>100

);

$font_url = './image/YGYcuhei.ttf';

$size = 38;

$color = array(

0=>2,

1=>222,

2=>222,

3=>60

);

$alpha = 60;

$angle = 50;

$image3 = new ImageToTest($src3);

$image3->imageMark($source,$local,$alpha);

$image3->thumb(700,550);

$image3->fontMark('Hello',$font_url,$size,$color,$local,$angle);

$image3->show();

$image3->save('WAWAWAWAWA');

希望本文所述对大家PHP程序设计有所帮助。