This article describes the ajax_upload upload progress bar code implemented by PHP apc ajax. Share it with everyone for your reference, the details are as follows:
How is the upload progress bar implemented? What is the principle? When we browse and select upload, a temporary file will be generated. When uploading, upload this temporary file to the server. After the upload is completed, this Temporary files will be deleted. If we can read the size of this temporary file, we will know the upload progress. The php apc module can implement this function.
1. Install apc module
Download address: http://pecl.php.net/package/apc
tar zxvf APC-3.1.8.tgz cd APC-3.1.8/ /usr/local/php/bin/phpize ./configure --with-php-config=/usr/local/php/bin/php-config make && make install
2. Modify php.ini
extension = apc.so apc.rfc1867 = 1 apc.max_file_size = 200M upload_max_filesize = 1000M post_max_size = 1000M max_execution_time = 600 max_input_time = 600 memory_limit = 128M
After modification, restart apache or other to check
[root@BlackGhost php]# php -m [PHP Modules] apc cgi-fcgi ctype curl date dom eAccelerator 。。。。。。。。
3. upload_test.php
<?php
$id = uniqid(rand(), true);
?>
<html>
<script type='text/javascript' src='jquery-1.3.2.js'></script>
<script type='text/javascript' src='ajaxupload.3.1.js'></script>
<script type='text/javascript' src='upload.js'></script>
<body style="text-align:center;">
<h1>上传测试</h1><form enctype="multipart/form-data" id="upload" method="POST">
<input type="hidden" name="APC_UPLOAD_PROGRESS" id="progress_key" value="<?=$id?>" />
<input type="file" id="file" name="file" value=""/><br/><input id="submit" type="submit" value="Upload!" />
</form>
<div id="progressouter" style="width: 500px; height: 20px; border: 1px solid black; display:none;">
<div id="progressinner" style="position: relative; height: 20px; background-color: red; width: 0%; ">
</div>
</div>
<br />
<div id='showNum'></div><br>
<div id='showInfo'></div><br>
</body>
</html>
<script type="text/javascript">
$(document).ready(function(){
form_submit();
});
</script>
What is the use of APC_UPLOAD_PROGRESS? It adds a tag to the uploaded file, and you can use this tag to access it in other PHP programs. Provide support for apc reading.
js file uploaded asynchronously by upload.js:
function form_submit (){
new AjaxUpload('#upload', {
action: 'upload.php',
name: 'file',
data: {
APC_UPLOAD_PROGRESS:$("#progress_key").val()
},
autoSubmit: true,
onSubmit: function(file, extension){
$('#progressouter').css('display', 'block');
progress();
},
onComplete: function(file, response){
$("#showInfo").html(response);
}
});
}
function progress (){
$.ajax({
type: "GET",
url: "progress.php?progress_key="+$("#progress_key").val(),
dataType: "json",
cache:false,
success: function(data){
if(data == 0) {
var precent = 0;
} else {
for (i in data) {
if (i == "current") {
var json_current = parseInt(data[i]);
}
if (i == "total") {
var json_total = parseInt(data[i]);
}
}
var precent = parseInt(json_current/json_total * 100);
$("#progressinner").css("width",precent+"%");
$("#showNum").html(precent+"%");
$("#showInfo").html("ok");
}
if ( precent < 100) {
setTimeout("progress()", 100);
}
}
});
}
One thing to note above is APC_UPLOAD_PROGRESS:$("#progress_key").val(). Here, the key is APC_UPLOAD_PROGRESS. If it is not this, apc cannot find the temporary file. Why should I use ajax_upload.js here? Because the ajax that comes with jquery does not have parameters for uploading files, that is, the content in type='file' cannot be obtained at the PHP end.
4. upload.php upload file
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST') {
if(empty($_FILES["file"]["tmp_name"])){
echo "no file";
die;
}
$tmp_name = $_FILES["file"]["tmp_name"];
$name = dirname($_SERVER['SCRIPT_FILENAME'])."/upload/".$_FILES["file"]["name"];
move_uploaded_file($tmp_name, $name);
echo "<p>File uploaded.</p>";
}
?>
If the file is relatively large, do not use http to upload it. It is too slow and affects the stability of the website.
5. progress.php is the progress file, used for ajax calls
<?php
if(isset($_GET['progress_key'])) {
$status = apc_fetch('upload_'.$_GET['progress_key']);
if($status['total']!=0 && !empty($status['total'])) {
echo json_encode($status);
} else {
echo 0;
}
}
?>
Look at the data generated by ajax asynchronous request.
php apc ajax upload progress bar
Parameter description:
total file size
current Uploaded size
filename Upload file name
name Tag name
done Successful upload is 1
cancel_upload The user cancels the upload, which will only happen when the upload is completed
rate upload speed, only available when the upload is completed
start_time Start time
Readers who are interested in more content related to PHP files and ajax operations can check out the special topics on this site: "Summary of PHP File Operations" and "Summary of PHP Ajax Skills and Applications"
I hope this article will be helpful to everyone in PHP programming.
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