


Principle: Set apache rewrite, and when the picture does not exist, call php to create the picture.
For example
The original image path is: http://localhost/upload/news/2013/07/21/1.jpg
The thumbnail image path is: http://localhost/supload/news/2013 /07/21/1.jpg
When accessing http://localhost/supload/news/2013/07/21/1.jpg, if the picture exists, the picture will be displayed. Otherwise, call createthumb.php to generate the image.
The directory structure is as follows:
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/ points to the www directory
PicThumb.class.php usage please check here
needs to enable apache rewrite
sudo a2enmod rewrite
.htaccess
<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
<?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
<?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
This article explains how to automatically generate thumbnails based on url through php. For more related content, please pay attention to php Chinese net.
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Introduction to the method of using php output_buffering cache
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How to use fsockopen GET/POST to submit forms and upload files through php
The above is the detailed content of How to automatically generate thumbnails based on url through php. For more information, please follow other related articles on the PHP Chinese website!

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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