PHP+FLASH实现上传文件进度条相关文件 下载_php技巧
PHP之所以很难实现上传进度条是因为在我们上传文件到服务器的时候，要等到文件全部送到服务器之后，才执行相应的php文件。在这之前，文件数据保存在一个临时文件里面，而php无法获得这个文件的路径及大小。
从Actionscript 2.0开始，Flash支持文件上传及下载了。虽然不能在服务端获得文件上传进度，但我们可以在服务端获得文件的发送进度。根据这个原理，用Flash就能做出上传进度条效果。
我在网上看到过一些资料，但是感觉有缺陷。于是自己研究了一下，在前人的基础上加强了程序的安全性和健壮性，并且增加了一些可自定义的参数。
说明：如果你的电脑安装了防火墙软件，那么可能会看到进度条一下就100%的情况。这是因为进度条显示的是flash把文件传给防火墙软件的速度！防火墙还要再将数据传到服务器。
演示请点击这里
本程序是Longbill 根据网上相关资料改进而成的
http://www.longbill.cn
Email: longbill.cn@gmail.com
调用参数说明(假设本flash名字为 upload.swf):
将flash文件的调用地址写成:
upload.swf?maxsize=[单个文件最大体积]&bgcolor=[进度条颜色]
&limit=[限制上传文件类型]&savefile=[上传对象文件]
[单个文件最大体积]：【可选】【数字】（单位为 KB）
[进度条颜色]: 【可选】【六位十六进制数字】【默认为随机颜色】(没有#的16位颜色值)
[限制上传文件类型]: 【可选】格式如: limit=zip|rar|doc
[上传对象文件]: 【默认为save.php】【字符串】
例如:
upload.swf?maxsize=2048&bgcolor=FF00FF&limit=jpg|gif|png&savefile=upsave.php
打包文件下载
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