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php中使用gd库实现远程图片下载实例_php实例

Jun 07, 2016 pm 05:12 PM
gd library php

因为今天想写个远程下载图片的类,提前热身写了个php gd库实现远程图片下载功能,当然curl实现更好,php gd库实现远程图片下载功能主要使用gd库的两个函数ImageCreateFromXXX()用于生成图片函数和ImageXXX函数,XXX表示不同图片的扩展名,所以你要想办法获取远程图片的扩展名了,附上php代码如下:

<&#63;php
header("Content-type:text/html ; charset=utf-8");
 
if (!empty($_POST['submit'])){
 $url = $_POST['url'];
 $pictureName = $_POST['pictureName'];
 $img = getPicture($url,$pictureName);
 echo '<pre class="brush:php;toolbar:false"><img  src="/static/imghw/default1.png"  data-src="'.$img.'"  class="lazy".$img.'" alt="php中使用gd库实现远程图片下载实例_php实例" >
Copy after login
'; } function getPicture($url,$pictureName){ if ($url == "") return false; //获取图片的扩展名 $info = getimagesize($url); $mime = $info['mime']; $type = substr(strrchr($mime,'/'), 1); //不同的图片类型选择不同的图片生成和保存函数 switch($type){ case 'jpeg': $img_create_func = 'imagecreatefromjpeg'; $img_save_func = 'imagejpeg'; $new_img_ext = 'jpg'; break; case 'png': $img_create_func = 'imagecreatefrompng'; $img_save_func = 'imagepng'; $new_img_ext = 'png'; break; case 'bmp': $img_create_func = 'imagecreatefrombmp'; $img_save_func = 'imagebmp'; $new_img_ext = 'bmp'; break; case 'gif': $img_create_func = 'imagecreatefromgif'; $img_save_func = 'imagegif'; $new_img_ext = 'gif'; break; case 'vnd.wap.wbmp': $img_create_func = 'imagecreatefromwbmp'; $img_save_func = 'imagewbmp'; $new_img_ext = 'bmp'; break; case 'xbm': $img_create_func = 'imagecreatefromxbm'; $img_save_func = 'imagexbm'; $new_img_ext = 'xbm'; break; default: $img_create_func = 'imagecreatefromjpeg'; $img_save_func = 'imagejpeg'; $new_img_ext = 'jpg'; } if ($pictureName == ""){ $pictureName = time().".{$new_img_ext}"; }else{ $pictureName = $pictureName.".{$new_img_ext}"; } $src_im = $img_create_func($url); //由url创建新图片 $img_save_func($src_im, $pictureName); //输出文件到文件 return $pictureName; } ?>
远程url地址:
文件名称:

运行结果如下图:(图片自动保存在当前文件目录,不明白的可以留言)


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