At some point in your career, you will want to build true dynamic web applications. Maybe decide to write your social network. As a developer, you will try to interest users, give them the opportunity to upload photos, music, share files. In this case, you need to know and be able to work with the PHP function move uploaded file.
Data collection form
PHP supports uploading any files using the POST method. Therefore, to transfer data to the server, or save it to the local machine, an HTML form is needed. Use markup to highlight a separate place where the user can select a file. The scripts need to be set up so that the data is sent without failure. Let's look at this process using the example of uploading a profile photo.
Note the enctype="multipart/form-data" attribute. It is thanks to him that the form is configured to receive data. To prevent users from thinking of uploading 25 MB cats, it is necessary to set a limit on the size of pictures in the hidden field. For2 MB profile picture is enough, as in this example.
Submit image
In the above form, the action attribute contains, which means that the image will be received and processed in the same document. If this confuses you and you want to have a separate script for each action, insert the script name in place of the construct, for example, create_profile.php. Now write all your code, including the PHP move uploaded file function, in this file.
'Max. file size specified in php.ini', 2=> 'Exceeded max. file size specified in HTML form', 3=> 'Only part of the file was sent', 4=> 'No file was selected to send.'); //check file upload error ($_FILES[$image_fieldname]['error']==0) or die("An error occurred while uploading file". $php_errors[$_FILES[$image_fieldname]['error']]); //check if the file is being uploaded normally or if it's a hack @is_uploaded_file($_FILES[$image_fieldname]['tmp_name']) or die('You will commit an immoral act, shame on you!'."File name: "."'{$ _FILES[$image_fieldname]['tmp_name']}'"); //is the file being sent an image @getimagesize($_FILES[$image_fieldname]['tmp_name']) or die("Error! The file you selected is not an image". "File name {$_FILES[$image_fieldname]['tmp_name']}"); //assigning a unique name to the uploaded file $now=time(); while(file_exists($upload_filename=$uploads_dir.$now.'-'.$_FILES[$image_fieldname]['name'])){ $now++; } ?>
There are auxiliary variables in the code:
- $upload_dir contains the path to the upload directory. Instead of HOSW_WWW_ROOT, write the absolute path to the working directory on the server or on your computer.
- The $image_fieldname variable is the field name for the image in the HTML form.
As you can see, before the move uploaded file call, there are lines that check the uploaded image. Of course, secure PHP applications are a myth, but there should be at least minimal protection.
The $php_errors error checking array does not start from zero, but from one. Index [0] is $_FILES[$image_fieldname]['error'], which returns the number 0 if the upload was successful. In PHP, $_FILES is a special array containing all the information about a file. To access this data, an index is used with the name of the input field, which we previously displayed in a separate variable $image_fieldname:
//check file upload error ($_FILES[$image_fieldname]['error']==0) or die("An error occurred while uploading file". $php_errors[$_FILES[$image_fieldname]['error']]);
When move uploaded file PHP doesn't work
Do you think you did everything right, but the interpreter throws an error? The file refuses to be uploaded to the assigned directory and appears in completely unexpected places? First of all check php.ini for allowed size in upload_max_filesize parameter. Most often, this error occurs with Denver. That's whyopen php.ini (usually located in the php folder) and just set the size you need:
;;;;;;;;;;;;;;;;;; File Uploads;;;;;;;;;;;;;;;;;; Whether to allow HTTP file uploads.; http://php.net/file-uploads file_uploads=On; Temporary directory for HTTP uploaded files (will use system default if not; specified).; http://php.net/upload-tmp-dir upload_tmp_dir=""; Maximum allowed size for uploaded files.; http://php.net/upload-max-filesize upload_max_filesize=5M; Maximum number of files that can be uploaded via a single request max_file_uploads=50
If you work on a server, ask your ISP what size files are allowed to be uploaded. On free hosting, the maximum size is usually 2 MB. The second reason code can fail is an incorrectly assigned directory. Check the second argument of the move_uploaded_file function, it must include the path and the name is required.
