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Add text watermark to images with php, _PHP tutorial

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WBOYOriginal
2016-07-13 09:45:21825browse

Add text watermarks to pictures with php,

The comments are very detailed, so there won’t be too much nonsense here

<&#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);
&#63;>

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1041325.htmlTechArticlephp adds text watermarks to pictures. The comments are very detailed, so there won’t be much nonsense here. php/*Add text to pictures Method of adding text watermark*/$dst_path = 'http://f4.topitme.com/4/15/11/1166351597fe11...
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