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php给图片加文字水印

Jun 20, 2016 pm 12:51 PM

<?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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