PHP pictures, files bulk upload code _php tutorial

PHP image, file bulk upload code

Whether it is a file or a picture batch upload our first is to do in HTML name=userfile[] This array variable, in PHP accept we do for ($_i=0; $_i<$_cont; $_i++) traversal so that the file can be uploaded in bulk, Let me take a look at an example

Example

The code is as follows

Session_Start (); ?> <title>Bulk upload of PHP files</title> Bulk upload of PHP files if ($_get[' up ']==up) { Prevent duplicate Submissions if ($_session[' file ']==$_get[' Irand ')} { $_cont=intval ($_post[' cont '); The total number of file boxes is received and converted to integer type $_size=20000; Set Limit file size $_dir= ' pdir/'; File Save Directory function Size ($_size) { Determines whether the file size is greater than 1024bit if it is greater than, the size is a value of KB, and so on 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 '; } } Set the upload image type, set the image upload size $_upfiles = Array (' Image/jpeg ', ' image/pjpeg ', ' image/png ', ' image/x-png ', ' image/gif '); Uploading files with a for loop for ($_i=0; $_i<$_cont; $_i++) { if (Is_array ($_upfiles)) { if (!in_array ($_files[' userfile ' [' Type '][$_i],$_upfiles)}) { Exit (' Please upload format: jpg,png,gif file Return '); } } Determine file size if ($_files[' userfile ' [' Size '][$_i]>$_size) { Exit (' Upload file cannot exceed: '. Size ($_size)); } Detects if the file has been uploaded if ($_files[' userfile ' [' Error '][$_i]>0) { Switch ($_files[' userfile ' [' Error '][1]) { Case 1:echo ' uploaded file exceeds the value of upload_max_filesize option limit 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 ' file is only partially uploaded '; Break Case 4:echo ' No files were uploaded '; Break Case 6:echo ' Unable to find temp folder '; Break Case 7:echo ' file write Failed '; Break } Exit } Get file name extension if (!is_dir ($_dir)) { mkdir ($_dir,0700); } Number of essays generated $_rand=mt_rand (0,100000); Get file name extension $_n=explode ('. ', $_files[' userfile ' [' name '][$_i]); Splitting a file name $_file_len=count ($_n); Returns the array length Ensure that the obtained extension is the last one. The back of the $_name=$_dir.time (). ' _ '. $_rand. '. $_N[$_FILE_LEN-1]; Move a file to a 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 upload succeeded '; Echo ' File path: '. $_name. ' '; echo ' File size: '. Size (filesize ($_name)); Echo ' Return to continue uploading '; } }else { Exit (' The uploaded temporary file does not exist, cannot move the file to the specified folder '); } } There are several ways to destroy session variables First, destroy all session variables: Session_destroy (); Second type: Destroy individual such as: $_session[' file ']= ' Session_destroy (); Exit }else { Exit (' You have already submitted, you cannot repeat the submission Return '); } } ?>

Core principle Analysis

In the multi-file upload, our front desk is the most important

The code is as follows

These lines of code with details of the friends will find Name= "userfile[", this is stored in an array, so that we can use JS to increase this way, then how to get in PHP?

Crossing PHP processing on multiple files is a key

code as follows
for ($_i=0; $_i<$_cont; $_i++) { if (is_uploaded_file ($_files[' userfile '] [' tmp_name '][$_i])) { if (! @move_uploaded_file ($_files[' userfile '] [' Tmp_name '][$_i],$_name)} { Exit (' file move failed '); } else { echo ' file upload succeeded '; Echo ' File path: '. $_name. ' '; Echo ' File size: '. Size (filesize ($_name)); Echo ' returns to continue uploading '; } }

Here it is very simple we will see that there is a for,for is traversing the array, traversing the userfile[] array, and then by $_files[' userfile ' [' Tmp_name '][$_i] to obtain a different file image and upload it, note [$_i] Is your multi-file upload item, just to protect the array.

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