Two PHP implementation codes for adding watermarks to images, _PHP tutorial

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Release: 2016-07-13 09:45:27
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Two PHP implementation codes for adding watermark to images,

The simplest way to add watermark in PHP

<&#63;php
$img = imagecreatefromjpeg($filename);
$logo = imagecreatefromjpeg($filename);
/*imagecraetefromjpeg-由文件或URL创建一个新图像
imagecreatefromjpeg(string $filename)
如果启用了fopen包装器,URL可以作为文件名*/
imagecopy($img,$logo,15,15,0,0,$width,$height);
/*imagecopy($dst_im,$src_im,$dst_x,$dst_y,$src_x,$src_y,$src_w,$src_h)
$dst_im是背景图像,就是需要添加水印的图片
$src_im是水印图片;$dst_x,#dst_y需要把水印放到背景图片的(x,y)坐标;
$src_x,$src_y是截取水印的图片的开始坐标
$width,$height是截取的图片的就是水印的长度和宽度*/
$url = 'http://www.stchat.cn/data/attachment/forum/201506/12/100759pidbdaydh8dy7iby.jpg';
$content = file_get_contents($url);//把url写入到content这个变量里面
/*file_get_contents--将整个文件读入到一个字符串*/
$filename = 'tmp.jpg';
file_put_contents($filename,$content);
//把所有内容放到filename这个变量里面,第一个存放的是背景图片
/*file_put_contents(string $filename,mixed $data)将一个字符串写入一个文件
filename要被写入数据的文件名
data要写入的数据,类型可以是string,array或者是stream资源*/
$url = '';
file_put_contents('logo.png',file_get_contents($url));
//第二个是水印的图片
$img = imagecreatefromjpeg($filename);
$logo = imagecreatefrompng('logo.png');
$size = getimagesize('logo.png');
/*getimagesize()获得图像大小*/
imagecopy($img,$logo,15,15,0,0,$size[0],$size[1]);
header("centent-type:image/jpeg");
imagejpeg(img);
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Add text watermark to pictures with php

<&#63;php
/*给图片加文字水印的方法*/
$dst_path = 'http://f4.topitme.com/4/15/11/1166351597fe111154l.jpg';
$dst = imagecreatefromstring(file_get_contents($dst_path));
/*imagecreatefromstring()--从字符串中的图像流新建一个图像,返回一个图像标示符,其表达了从给定字符串得来的图像
图像格式将自动监测,只要php支持jpeg,png,gif,wbmp,gd2.*/
 
$font = './t1.ttf';
$black = imagecolorallocate($dst, 0, 0, 0);
imagefttext($dst, 20, 0, 10, 30, $black, $font, 'Hello world!');
/*imagefttext($img,$size,$angle,$x,$y,$color,$fontfile,$text)
$img由图像创建函数返回的图像资源
size要使用的水印的字体大小
angle(角度)文字的倾斜角度,如果是0度代表文字从左往右,如果是90度代表从上往下
x,y水印文字的第一个文字的起始位置
color是水印文字的颜色
fontfile,你希望使用truetype字体的路径*/
list($dst_w,$dst_h,$dst_type) = getimagesize($dst_path);
/*list(mixed $varname[,mixed $......])--把数组中的值赋给一些变量
像array()一样,这不是真正的函数,而是语言结构,List()用一步操作给一组变量进行赋值*/
/*getimagesize()能获取到什么信息?
getimagesize函数会返回图像的所有信息,包括大小,类型等等*/
switch($dst_type){
  case 1://GIF
    header("content-type:image/gif");
    imagegif($dst);
    break;
  case 2://JPG
    header("content-type:image/jpeg");
    imagejpeg($dst);
    break;
  case 3://PNG
    header("content-type:image/png");
    imagepng($dst);
    break;
  default:
    break;
  /*imagepng--以PNG格式将图像输出到浏览器或文件
  imagepng()将GD图像流(image)以png格式输出到标注输出(通常为浏览器),或者如果用filename给出了文件名则将其输出到文件*/
}
imagedestroy($dst);
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The above is the implementation code for adding watermark to images in PHP. I hope you can master it.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1040818.htmlTechArticleTwo PHP implementation codes for adding watermarks to images, PHP’s simplest watermarking method php$img = imagecreatefromjpeg( $filename);$logo = imagecreatefromjpeg($filename);/*imagecraetefromjpeg-by...
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