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PHP利用APC模块实现文件上传进度条的方法

Jun 06, 2016 pm 08:12 PM
apc php use File Upload method module progress bar

这篇文章主要介绍了PHP利用APC模块实现文件上传进度条的方法,分析了APC模块的具体用法,并给出了相关配置说明,需要的朋友可以参考下

本文实例讲述了PHP利用APC模块实现文件上传进度条的方法。分享给大家供大家参考。具体分析如下:

以前的php5.2之前的版本是不能可使用APC模块的,因为之前的压根就没有这个APC模块,如果想使用APC模块实现上传进度条我们必须是php5.2或更高版本.

从5.2开始APC加入了一个叫APC_UPLOAD_PROGRESS的东东,解决了困扰大家已久的进度条问题。并且它把原来的上传时把临时文件全部缓存到内存改成了当临时文件达到设定值时就自动保存到硬盘,有效地改善了内存利用状况。

它的作用原理是在上传时候赋予每个上传一个唯一的ID,当 PHP 脚本收到一个上传文件时,解释程序将自动检查 $_POST数组中名为 APC_UPLOAD_PROGRESS 的隐藏字段,它将成为缓存变量,存储关于上传的信息,,这样脚本就可以通过上传的ID来访问上传文件的状态信息。

APC是Alternative PHP Cache的简称,是 PHP 的一个免费公开的优化代码缓存。它用来提供免费,公开并且强健的架构来缓存和优化 PHP 的中间代码。

APC模块的参数配置,代码如下:

复制代码 代码如下:

Name Default Changeable Changelog 
apc.enabled 1 PHP_INI_ALL 
apc.shm_segments 1 PHP_INI_SYSTEM 
apc.shm_size 30 PHP_INI_SYSTEM 
apc.optimization 0 PHP_INI_ALL 
apc.num_files_hint 1000 PHP_INI_SYSTEM 
apc.ttl 0 PHP_INI_SYSTEM 
apc.gc_ttl 3600 PHP_INI_SYSTEM 
apc.cache_by_default On PHP_INI_SYSTEM 
apc.filters "" PHP_INI_SYSTEM 
apc.mmap_file_mask "" PHP_INI_SYSTEM 
apc.slam_defense 0 PHP_INI_SYSTEM 
apc.file_update_protection 2 PHP_INI_SYSTEM 
apc.enable_cli 0 PHP_INI_SYSTEM > APC 3.0.6


好了配置好了现在就开始写程序了

XML/HTML代码如下:

复制代码 代码如下:

 

 
 
视频标题: 
视频说明: 
视频TAG(以逗号分割) 
 
 
 
 
 
 
 
 
 

最主要的就是那个APC_UPLOAD_PROGRESS的隐藏域,有了它脚本才能去访问目前上传文件的状态,另外加一个显示上传状态的div就好了.

下面是处理Ajax的脚本,我用了Jquery框架,json传递消息.

JavaScript代码如下:

复制代码 代码如下:

function getProgress(upid){ 
var url = "epadmin/upprocess"; 
$.getJSON( 
url, 
{ progress_key: upid }, 
function(json){ 
$("#progressinner").width(json.per+"%"); 
$("#upstatus").html('文件大小:'+json.total+'KB'+' 已上传:'+json.current+'KB'); 
if (json.per setTimeout(function(){ 
getProgress(upid); 
}, 10); 
}else{ 
$("#upstatus").html("视频上传完成,正在处理数据,请稍后……"); 




function startProgress(upid){ 
$("#progressouter").css({ display:"block" }); 
setTimeout(function(){ 
getProgress(upid); 
}, 100); 
}


再下面就是读取上传状态的PHP代码了,至于上传文件的处理可以按照平常自己的来写,代码如下:

复制代码 代码如下:

//上传文件操作函数,可按照自己的需要编写 
function upflvAction() 

if($_SERVER['REQUEST_METHOD']=='POST'){ 
$subject = trim($this->f->filter($this->_request->getPost('subject'))); 
$content = trim($this->f->filter($this->_request->getPost('content'))); 
Zend_Loader::loadClass('Custom_FlvOp'); 
$flv = new Custom_FlvOp; 
$flv->uploadFlv('upfile',$subject,$content); 
}

//这就是读取上传状态的函数了~~ 
function upprocessAction() 
{  
if(isset($_GET['progress_key'])) { 
$status = apc_fetch('upload_'.$_GET['progress_key']); 
$json = array( 
'per'=>$status['current']/$status['total']*100, 
'total'=>round($status['total']/1024), 
'current'=>round($status['current']/1024), 
); 
require_once("Zend/Json.php"); 
echo Zend_Json::encode($json); 

}


一些关于apc配置详解:

apc.enabled  布尔型

apc.enabled 可以被设成 0 来禁用 APC,这主要是有用的,当 APC 被静态编译入 PHP 时,因为没有其它方法来禁用它,当编译为 DSO 的时候,可以将 php.ini 中的 extension 行注释掉.

apc.shm_segments  整型

对编译缓存分配共享内存块的数量,如果APC用光了共享内存,而且你已经设置 apc.shm_size为系统允许的最大值的情况下,你可以试着去提高这个参数的值.

apc.shm_size  整型

每个共享内存块的大小是以MB为单位的。在默认情况下,一些系统(包括大多数BSD变种系统)的共享内存块的大小限制的很低。

apc.optimization  整型

优化等级。设为0则禁用优化,越高的值使用越强有力的优化。期待有适度的速度上的改进。这个还是实验性质的。

apc.num_files_hint  整型

对在你的Web服务器上被包含和请求的不同的源文件的数量的提示。如果你无法确定,设置为0或者省略;这个设置主要可能用于有成千的源文件的站点。

apc.ttl  整型

当一个缓存条目在缓存区的位置被另一个条目需要时,我们需要考虑的是这个缓存条目在缓存区的位置被允许空闲的秒数。将这个参数设置为0意味着你的缓存可能充满不新鲜的条目,同时导致新的条目无法被缓存。

apc.gc_ttl  整型

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