Using APC module to implement file upload progress bar in PHP_PHP tutorial

The APC module cannot be used in previous versions of php5.2, because there was no such APC module at all. If you want to use the APC module to implement the upload progress bar, we must be in php5.2 or higher.

Starting from 5.2, APC has added something called APC_UPLOAD_PROGRESS, which solves the progress bar problem that has been bothering everyone for a long time. And it changed the original method of caching all temporary files into the memory during uploading to automatically saving them to the hard disk when the temporary files reach the set value, which effectively improved the memory utilization.

It works by giving each upload a unique ID when uploading. When the PHP script receives an uploaded file, the interpreter will automatically check the hidden field named APC_UPLOAD_PROGRESS in the $_POST array. It Will become a cache variable that stores information about the upload so scripts can access status information about the uploaded file via the upload ID.

APC is the abbreviation of Alternative PHP Cache, which is a free and public optimized code cache for PHP. It is used to provide a free, open and robust framework for caching and optimizing PHP intermediate code.

Parameter configuration of APC module

The code is as follows

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代码如下

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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

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_SY STEM
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

Once configured, start writing the program now

XML/HTML code

代码如下	复制代码
视频标题： 视频说明： 视频TAG(以逗号分割)

The code is as follows	Copy code
< ;!–The following is the upload form–> Video title: Video description: Video TAG (separated by commas)

The most important thing is the hidden field of APC_UPLOAD_PROGRESS. With it, the script can access the status of the currently uploaded file, and just add a div to display the upload status.

The following is a script to handle Ajax. I used the Jquery framework and json to transmit messages.

JavaScript code

The code is as follows

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代码如下

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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

function getProgress(upid){
var url = "epadmin/upprocess"; $.getJSON(
url,
{ progress_key: upid },
function(json){
$("#progressinner").width(json.per+" %");
$("#upstatus").html('File size:'+json.total+'KB'+' Uploaded:'+json.current+'KB');
if (json.per setTimeout(function(){
getProgress(upid);
}, 10);
}else{
$( "#upstatus").html("Video upload completed, data is being processed, please wait...");
}
}
)
}
function startProgress(upid){
$("#progressouter").css({ display:"block" });
setTimeout(function(){
getProgress(upid);
}, 100);
}

Then

The next step is to read the PHP code of the upload status. As for uploading files The processing can be written as usual.

代码如下

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//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); } }

Some details about apc configuration

apc.enabled Boolean
apc.enabled can be set to 0 to disable APC. This is mainly useful when APC is statically compiled into PHP, since there is no other way to disable it (when compiling as DSO, the extension line in php.ini can be commented out).

apc.shm_segments Integer
The number of shared memory blocks allocated to the compilation cache. If APC runs out of shared memory and you have set apc.shm_size to the maximum value allowed by the system, you can try to increase the value of this parameter.

apc.shm_size integer
The size of each shared memory block is in MB. By default, some systems (including most BSD variants) have very low shared memory block size limits.

apc.optimization integer
optimization level. Set to 0 to disable optimization, higher values ​​use more powerful optimizations. Expect modest speed improvements. This is still experimental in nature.

apc.num_files_hint integer
Hint for the number of different source files that are included and requested on your web server. If you are unsure, set it to 0 or omit it; this setting is likely to be useful primarily on sites with thousands of source files.

apc.ttl Integer
When a cache entry is needed by another entry in the cache area, what we need to consider is the number of seconds this cache entry is allowed to be idle in the cache area. Setting this parameter to 0 means that your cache may be filled with stale entries, and new entries will not be cached.

apc.gc_ttl Integer
Number of seconds for cache entries to live in the garbage collection list. This value provides error protection in the event that a cached source file is executed while the server process dies. If that source file is modified, the memory allocated to the old version of the cache entry will not be reclaimed until the TTL value set by this parameter is reached. Setting it to 0 disables this feature.

apc.cache_by_default Boolean
Defaults to On, but can be set to Off and used with apc.filters starting with a plus sign. Files will only be cached if they match the filter.

apc.filters String
A comma-separated list of POSIX extended regular expressions. If any pattern matches the source file name, the file will not be cached. Note that the file name used to match is the file name passed to include/require, not the absolute path. If the first character of the regular expression is + , then the expression means that any file matching the expression will be cached, if the first character is - then any matches will not be cached. - is the default value, so can be omitted.

apc.mmap_file_mask string

apc.slam_defense integer
On a very busy server, whether you start a service or modify a file, you will cause a kind of multi-processing Competition from both trying to cache the same file at the same time. This option sets the percentage at which the process skips attempts to cache an uncached file. Or think of this as the probability of a single process skipping the cache. For example, setting apc.slam_defense to 75 means that the process has a 75% chance of not caching uncached files. Therefore, the higher the setting, the more likely it is to reduce the cache collision probability. Set to 0 to disable this feature.

apc.file_update_protection integer
When you modify a file on a running server, you should perform atomic operations. That is, write a temporary file first, and then rename (mv) the file to its final location when finished. Many text editors, cp, tar and some other similar programs do not operate this way. This means there is an opportunity to access and (cache) the file while the file is still being written. The setting of apc.file_update_protection causes the cache to delay marking new files. The default value is 2, which means that if the modification time of the file is found to be less than 2 seconds from the access time, the file will not be cached. Unlucky users who access a half-written file will see bizarre behavior, but at least it's not persistent. If you are sure that you frequently use atomic operations to update your files, you can turn off this protection by setting this parameter to 0. If your system is flooded with IO operations and causing the update process to take more than 2 seconds, you may need to increase this value.

apc.enable-cli Integer
mostly for testing and debugging. Enable the APC function for the CLI version of PHP. Generally speaking, you wouldn't think of creating, porting, and discarding APC's cache for every CLI request, but for various testing situations, it's easy enough to turn on APC for the CLI version.

http://www.bkjia.com/PHPjc/444621.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444621.htmlTechArticlePrevious versions of php5.2 cannot use the APC module, because the previous version did not have this APC at all Module, if you want to use the APC module to implement the upload progress bar, we must be php5.2 or more...