PHP image and file batch upload code_PHP tutorial

PHP image and file batch upload code

Whether it is file or image batch upload, the first thing we do is to make an array variable like name=userfile[] in html, in php During acceptance, we do for ($_i=0; $_i

Example

代码如下

session_start(); ?> <script><br /> $(document).ready(function() {<br /> $('#cont').val($('.file #file').size());<br /> $('#send').eq(0).click(function() {<br /> var filesize=$('.file #file').size();<br /> $('.file').append("<input type='file' name='userfile[]' id='file'/>");<br /> $('#cont').val(filesize+1);<br /> });<br /> });<br /> </script> PHP文件批量上传 if ($_GET['up']==up) { //防止重复提交 if ($_SESSION['file']==$_GET['irand']) { $_cont=intval($_POST['cont']);   //将file框总数接收并转换成整型 $_size=20000;                    //设置限制文件大小 $_dir='pdir/';                   //文件保存目录 function size($_size) { //判断文件大小是否大于1024bit 如果大于，则将大小取值为KB，以此类推 if ($_size>1024*1024) { return round($_size/1024/1024,2).' MB'; }else if ($_size>1024) { $_size=$_size/1024; return ceil($_size).'KB'; }else { return $_size.' bit'; } } //设置上传图片的类型,设置图片上传大小 $_upfiles = array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif'); //利用for循环上传文件 for ($_i=0; $_i if (is_array($_upfiles)) { if (!in_array($_FILES['userfile']['type'][$_i],$_upfiles)) { exit('Please upload files in the format: jpg, png, gif Return'); } } //Judge file size if ($_FILES['userfile']['size'][$_i]>$_size) { exit('Uploaded files cannot exceed:'.size($_size)); } //Check whether the file has been uploaded if ($_FILES['userfile']['error'][$_i]>0) { switch ($_FILES['userfile']['error'][1]) { case 1: echo 'The uploaded file exceeds the limit of the upload_max_filesize option in php.ini'; break; case 2: echo 'The size of the uploaded file exceeds the value specified by the MAX_FILE_SIZE option in the HTML form'; break; case 3: echo 'Only part of the file was uploaded'; break; case 4: echo 'No files uploaded'; break; case 6: echo 'Temp folder not found'; break; case 7: echo 'File writing failed'; break; } exit; } //Get file extension if (!is_dir($_dir)) { mkdir($_dir,0700); } //Generate number of essays $_rand=mt_rand(0,100000); //Get file extension $_n=explode('.',$_FILES['userfile']['name'][$_i]); //Split the file name $_file_len=count($_n); //Return the array length //Make sure the extension obtained is the last one. The following $_name=$_dir.time().'_'.$_rand.'.'.$_n[$_file_len-1]; //Move the file to the specified directory if (is_uploaded_file($_FILES['userfile']['tmp_name'][$_i])) { if (!@move_uploaded_file($_FILES['userfile']['tmp_name'][$_i],$_name)) { exit('File move failed'); }else { echo 'File uploaded successfully '; echo 'File path:'.$_name.' '; echo 'File size:'.size(filesize($_name)); echo ' Return to continue uploading'; } }else { exit('The uploaded temporary file does not exist and the file cannot be moved to the specified folder'); } } //Destroy session variables, there are several methods //The first one, destroy all session variables: session_destroy(); //Second type: Destroy a single item such as: $_SESSION['file']='' session_destroy(); exit; }else { exit('You have already submitted and cannot submit again Return'); } } ?>

　　核心原理分析

　　在多文件上传中我们前台最重要的是

 代码如下

代码如下

　　这几行代码有细节的朋友会发现name="userfile[]"了，这个是以数组存储了，这样我们如果使用js也可以这样增加就可以了，那么在php是如何获取的呢

　　在多文件上传中php处理是一个关键

 代码如下

for ($_i=0; $_i if (is_uploaded_file($_FILES['userfile']['tmp_name'][$_i])) {
if (!@move_uploaded_file($_FILES['userfile']['tmp_name'][$_i],$_name)) {
exit('文件移动失败');
}else {
echo '文件上传成功
';
echo '文件路径：'.$_name.'
';
echo '文件大小：'.size(filesize($_name));
echo '
返回继续上传';
}
}

代码如下
for ($_i=0; $_i if (is_uploaded_file($_FILES['userfile']['tmp_name'][$_i])) { if (!@move_uploaded_file($_FILES['userfile']['tmp_name'][$_i],$_name)) { exit('文件移动失败'); }else { echo '文件上传成功 '; echo '文件路径：'.$_name.' '; echo '文件大小：'.size(filesize($_name)); echo ' 返回继续上传'; } }

　　这里显示很简单我们会看到有一个for，for就是遍历数组，遍历userfile[]数组，然后再由$_FILES['userfile']['tmp_name'][$_i]来获取不同文件图片再进行上传即可，注意[$_i]就是你的多文件上传项了，只是保存在了数组中。

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