php中使用gd库实现远程图片下载实例

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<?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><img src="'.$img.'"></pre>';

}

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;

}

?>

<form method="POST" action="">

远程url地址：<input type="text" name="url" size=20 /><br />

文件名称：<input type="text" name="pictureName" size=20 />

<input type="submit" name="submit" value="下载" />

</form>