php实现根据url自动生成缩略图的方法,url自动生成
本文实例讲述了php实现根据url自动生成缩略图的方法,是非常实用的功能。分享给大家供大家参考。具体方法如下:
原理:设置apache rewrite ,当图片不存在时,调用php创建图片。
例如:
原图路径为:http://localhost/upload/news/2013/07/21/1.jpg
缩略图路径为:http://localhost/supload/news/2013/07/21/1.jpg
当访问 http://localhost/supload/news/2013/07/21/1.jpg 时,如图片存在,则显示图片。否则,调用createthumb.php生成图片。
目录结构如下:
www/PicThumb.class.php
www/ThumbConfig.php
www/upload/news/2013/07/21/1.jpg
www/upload/article/2013/07/21/2.jpg
www/supload/.htaccess
www/supload/watermark.png
www/supload/createthumb.php
http://localhost/ 指向 www目录
PicThumb.class.php 用法请查看这里:http://www.bkjia.com/article/55530.htm
需要开启apache rewrite:
sudo a2enmod rewrite
.htaccess文件如下:
<IfModule mod_rewrite.c> RewriteEngine On # '-s' (is regular file, with size) # '-l' (is symbolic link) # '-d' (is directory) # 'ornext|OR' (or next condition) # 'nocase|NC' (no case) # 'last|L' (last rule) RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ createthumb.php?path=%{REQUEST_URI} [NC,L] </IfModule>
createthumb.php文件如下:
<?php define('WWW_PATH', dirname(dirname(__FILE__))); // 站点www目录 require(WWW_PATH.'/PicThumb.class.php'); // include PicThumb.class.php require(WWW_PATH.'/ThumbConfig.php'); // include ThumbConfig.php $logfile = WWW_PATH.'/createthumb.log'; // 日志文件 $source_path = WWW_PATH.'/upload/'; // 原路径 $dest_path = WWW_PATH.'/supload/'; // 目标路径 $path = isset($_GET['path'])? $_GET['path'] : ''; // 访问的图片URL // 检查path if(!$path){ exit(); } // 获取图片URI $relative_url = str_replace($dest_path, '', WWW_PATH.$path); // 获取type $type = substr($relative_url, 0, strpos($relative_url, '/')); // 获取config $config = isset($thumb_config[$type])? $thumb_config[$type] : ''; // 检查config if(!$config || !isset($config['fromdir'])){ exit(); } // 原图文件 $source = str_replace('/'.$type.'/', '/'.$config['fromdir'].'/', $source_path.$relative_url); // 目标文件 $dest = $dest_path.$relative_url; // 创建缩略图 $obj = new PicThumb($logfile); $obj->set_config($config); if($obj->create_thumb($source, $dest)){ ob_clean(); header('content-type:'.mime_content_type($dest)); exit(file_get_contents($dest)); } ?>
ThumbConfig.php文件如下:
<?php $thumb_config = array( 'news' => array( 'fromdir' => 'news', // 来源目录 'type' => 'fit', 'width' => 100, 'height' => 100, 'bgcolor' => '#FF0000' ), 'news_1' => array( 'fromdir' => 'news', 'type' => 'fit', 'width' => 200, 'height' => 200, 'bgcolor' => '#FFFF00' ), 'article' => array( 'fromdir' => 'article', 'type' => 'crop', 'width' => 250, 'height' => 250, 'watermark' => WWW_PATH.'/supload/watermark.png' ) ); ?>
访问这三个路径后会按config自动生成缩略图
http://localhost/supload/news/2013/07/21/1.jpg
http://localhost/supload/news_1/2013/07/21/1.jpg
http://localhost/supload/article/2013/07/21/2.jpg
本文所述实例完整代码点击此处本站下载。
希望本文所述对大家的php程序设计有所帮助。
需要php环境支持GD库。
$img_name=$_GET['img']; //获取查询字符串
$src_img=imagecreatefromjpeg($img_name);
$ow=imagesx($src_img);
$oh=imagesy($src_img);
$desc_img=imagecreate(400,300);
imagecopyresized($desc_img,$src_img,0,0,0,0,400,300,$ow,$oh);
imagejpeg($desc_img);
imagedestroy($desc_img);
imagedestroy($src_img);
?>
以上代码可以根据一个图片生成400*300的缩略图,如:
www.xx.com/image.php?img=1.jpg
要求1.jpg必须存在,大小任意。并且1.jpg和image.php在同一目录下。
www.xx.com/image.php?img=upload2009/1.jpg
也可以,不用改了,就用上面的。反正$img_name变量就是图片的url。你自己根据实际情况看着改吧。
给你个函数吧
// *****生成缩略图*****
// 只考虑jpg,png,gif格式
// $srcImgPath 源图象路径
// $targetImgPath 目标图象路径
// $targetW 目标图象宽度
// $targetH 目标图象高度
function makeThumbnail($srcImgPath,$targetImgPath,$targetW,$targetH)
{
$imgSize = GetImageSize($srcImgPath);
$imgType = $imgSize[2];
//@ 使函数不向页面输出错误信息
switch ($imgType)
{
case 1:
$srcImg = @ImageCreateFromGIF($srcImgPath);
break;
case 2:
$srcImg = @ImageCreateFromJpeg($srcImgPath);
break;
case 3:
$srcImg = @ImageCreateFromPNG($srcImgPath);
break;
}
//取源图象的宽高
$srcW = ImageSX($srcImg);
$srcH = ImageSY($srcImg);
if($srcW>$targetW || $srcH>$targetH)
{
$targetX = 0;
$targetY = 0;
if ($srcW > $srcH)
{
$finaW=$targetW;
$finalH=round($srcH*$finaW/$srcW);
$targetY=floor(($targetH-$finalH)/2);
}
else
{
$finalH=$targetH;
$finaW=round($srcW*$finalH/$srcH);
$targetX=floor(($targetW-$finaW)/2);
}
//function_exists 检查函数是否已定义
//ImageCreateTrueColor 本函数需要GD2.0.1或更高版本
if(function......余下全文>>

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