Php Upload Not Working on Windows Hosting
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In this article, I'll explain the basics of file upload in PHP. Firstly, we'll go through the PHP configuration options that need to exist in identify for successful file uploads. Following that, nosotros'll develop a real-globe instance of how to upload a file.
Configure the PHP Settings
There are a couple of PHP configuration settings that you lot'll want to check beforehand for successful file uploads. In this section, we'll get through every of import pick in regards to PHP file upload. These options tin be configured in the php.ini file.
If you're not sure where to find yourphp.ini file, y'all can use thephp_ini_loaded_file() to locate it. Simply create a PHP file on your server with the following line, and open it from the browser.
<?php echo php_ini_loaded_file(); ?>
Hither's an excerpt from a setup file with some useful defaults.
; Whether to allow HTTP file uploads. file_uploads = On ; Temporary directory for HTTP uploaded files. ; Will utilize system default if non prepare. ;upload_tmp_dir = ; Maximum allowed size for uploaded files. upload_max_filesize = 16M ; Maximum number of files that tin be uploaded via a single request max_file_uploads = twenty ; Maximum size of Mail information that PHP volition take. post_max_size = 20M max_input_time = threescore memory_limit = 128M max_execution_time = xxx
The Key Settings
file_uploads
The value of thefile_uploads directive should be set toOn to allow file uploads. The default value of this directive isOn.
upload_max_filesize
Theupload_max_filesize directive allows you to configure the maximum size of the uploaded file. By default, it's set to2M (two megabytes), and you can override this setting using the.htaccess file as well. Two megabytes isn't very much by today'southward standards, so you lot might have to increase this. If you get an error thatfile exceeds upload_max_filesize when you try to upload a file, you lot demand to increment this value. If you lot do, be sure to also increasepost_max_size (see beneath).
upload_tmp_dir
Sets a temporary directory which will be used to shop uploaded files. In most cases, yous don't need to worry nigh this setting. If you don't ready it, the system default temp directory will be used.
post_max_size
Thepost_max_size directive allows yous to configure the maximum size of Postal service information. Since files are uploaded with POST requests, this value must be greater than what you've set for theupload_max_filesize directive. For example, if yourupload_max_filesize is16M (16 megabytes), you might want to set uppost_max_size to20M.
max_file_uploads
It allows you to ready the maximum number of files that can be uploaded at a fourth dimension. The default is20, a sensible amount.
max_input_time
It's the maximum number of seconds a script is allowed to parse the input data. Yous should set up it to a reasonable value if yous're dealing with big file uploads.60 (60 seconds) is a expert value for near apps.
memory_limit
Thememory_limit directive indicates the maximum amount of memory a script can swallow. If you're facing issues when uploading large files, you need to brand certain that the value of this directive is greater than what you've set for the post_max_size directive. The default value is128M (128 megabytes), and then unless you accept a very bigpost_max_size andupload_max_filesize, you don't need to worry nearly this.
max_execution_time
It's the maximum number of seconds a script is immune to run. If yous're facing issues when uploading large files, you lot tin consider increasing this value. thirty (30 seconds) should piece of work well for most apps.
Now permit'south build a existent-globe example to demonstrate file upload in PHP.
Create the HTML Grade
Once you've configured the PHP settings, you're gear up to try out the PHP file upload capabilities.
Our GitHub repo has some sample code which I'm going to hash out throughout this commodity. And then, if you want to follow along, go alee and download it from GitHub.
We're going to create ii PHP files:index.php andupload.php. Theindex.php file holds code which is responsible for displaying the file upload grade. On the other paw, theupload.php file is responsible for uploading a file to the server.
Also, a file will be uploaded in theuploaded_files directory, so you need to make sure that this folder exists and is writable by theweb-server user.
In this section, nosotros'll become through the central parts of thealphabetize.php file.
Let's accept a look at thealphabetize.php file on GitHub:
<?php session_start(); ?> <!DOCTYPE html> <html> <head> <title>PHP File Upload</title> </head> <trunk> <?php if (isset($_SESSION['message']) && $_SESSION['message']) { repeat '<p form="notification">'.$_SESSION['message']).'</p>'; unset($_SESSION['bulletin']); } ?> <grade method="Mail" activeness="upload.php" enctype="multipart/class-information"> <div class="upload-wrapper"> <span grade="file-name">Choose a file...</bridge> <label for="file-upload">Scan<input type="file" id="file-upload" name="uploadedFile"></characterization> </div> <input type="submit" name="uploadBtn" value="Upload" /> </form> </body> </html> You tin can employ the post-obit CSS to give the form a more than appealing look.
div.upload-wrapper { color: white; font-weight: bold; display: flex; } input[type="file"] { position: absolute; left: -9999px; } input[type="submit"] { border: 3px solid #555; color: white; background: #666; margin: 10px 0; border-radius: 5px; font-weight: bold; padding: 5px 20px; cursor: pointer; } input[blazon="submit"]:hover { background: #555; } label[for="file-upload"] { padding: 0.7rem; display: inline-block; groundwork: #fa5200; cursor: pointer; border: 3px solid #ca3103; border-radius: 0 5px 5px 0; border-left: 0; } characterization[for="file-upload"]:hover { background: #ca3103; } span.file-name { padding: 0.7rem 3rem 0.7rem 0.7rem; white-infinite: nowrap; overflow: subconscious; background: #ffb543; color: blackness; border: 3px solid #f0980f; border-radius: 5px 0 0 5px; border-right: 0; } The CSS basically hides the original fileinput and styles its accompanyingbridge andlabel elements.
Although information technology may look like a typical PHP form, there'southward an important difference in the value of theenctype aspect of the<class> tag. It needs to exist set up tomultipart/form-data since the form contains the file field.
Theenctype attribute specifies the type of encoding which should be used when the form is submitted, and it takes ane of the following three values:
-
application/ten-www-form-urlencoded: This is the default value when you don't set the value of theenctypeattribute explicitly. In this example, characters are encoded before it's sent to the server. If you lot don't have the file field in your class, y'all should apply this value for theenctypeattribute. -
multipart/grade-data: When you use themultipart/class-datavalue for theenctypeattribute, it allows yous to upload files using the Mail method. Too, it makes sure that the characters are not encoded when the form is submitted. -
text/plainly: This is more often than not not used. With this setting, the data is sent unencoded.
Adjacent, nosotros output the file field, which allows you to select a file from your computer.
<input type="file" proper name="uploadedFile" />
Apart from that, we've displayed a message at the pinnacle of the grade. This message shows the status of the file upload, and it'll exist set up in a session variable by theupload.php script. We'll look more than at this in the next section.
<?php if (isset($_SESSION['bulletin']) && $_SESSION['message']) { echo '<p form="notification">'.$_SESSION['message']).'</p>'; unset($_SESSION['message']); } ?> So that sums up theindex.php file. In the adjacent department, nosotros'll see how to handle the uploaded file on the server side.
Create the Upload Logic
In the previous section, we created the HTML course which is displayed on the customer side and allows you to upload a file from your calculator. In this section, we'll run into the server-side counterpart which allows yous to handle the uploaded file.
Pull in the code from theupload.php file on GitHub. We'll get through the important parts of that file.
In theupload.php file, we've checked whether it's a valid Mail service request in the beginning place.
if (isset($_POST['uploadBtn']) && $_POST['uploadBtn'] == 'Upload') { ... } In PHP, when a file is uploaded, the$_FILES superglobal variable is populated with all the information about the uploaded file. It's initialized as an array and may incorporate the following information for successful file upload.
-
tmp_name: The temporary path where the file is uploaded is stored in this variable. -
name: The actual proper name of the file is stored in this variable. -
size: Indicates the size of the uploaded file in bytes. -
blazon: Contains the mime type of the uploaded file. -
error: If there's an error during file upload, this variable is populated with the appropriate error message. In the example of successful file upload, information technology contains 0, which you tin can compare by using theUPLOAD_ERR_OKconstant.
Afterward validating the Post asking, we check that the file upload was successful.
if (isset($_FILES['uploadedFile']) && $_FILES['uploadedFile']['error'] === UPLOAD_ERR_OK) { ... } You can see that the$_FILES variable is a multi-dimensional assortment, the first element is the name of the file field, and the second chemical element has the data about the uploaded file, as we've simply discussed to a higher place.
If the file upload is successful, we initialize a few variables with information about the uploaded file.
// get details of the uploaded file $fileTmpPath = $_FILES['uploadedFile']['tmp_name']; $fileName = $_FILES['uploadedFile']['name']; $fileSize = $_FILES['uploadedFile']['size']; $fileType = $_FILES['uploadedFile']['type']; $fileNameCmps = explode(".", $fileName); $fileExtension = strtolower(end($fileNameCmps)); In the to a higher place snippet, we've besides figured out the extension of the uploaded file and stored it in the$fileExtension variable.
Every bit the uploaded file may contain spaces and other special characters, it's better to sanitize the filename, and that's exactly nosotros've washed in the following snippet.
$newFileName = md5(time() . $fileName) . '.' . $fileExtension;
It's important that you restrict the type of file which tin can be uploaded to certain extensions and don't allow everything using the upload grade. We've done that past checking the extension of the uploaded file with a prepare of extensions that we want to allow for uploading.
$allowedfileExtensions = array('jpg', 'gif', 'png', 'zip', 'txt', 'xls', 'doc'); if (in_array($fileExtension, $allowedfileExtensions)) { ... } Finally, we use themove_uploaded_file function to move the uploaded file to the specific location of our choice.
// directory in which the uploaded file will be moved $uploadFileDir = './uploaded_files/'; $dest_path = $uploadFileDir . $newFileName; if(move_uploaded_file($fileTmpPath, $dest_path)) { $message ='File is successfully uploaded.'; } else { $message = 'There was some error moving the file to upload directory. Please make sure the upload directory is writable by web server.'; } Themove_uploaded_file part takes two arguments. The start argument is the filename of the uploaded file, and the second argument is the destination path where you want to motility the file.
Finally, we redirect the user to theindex.php file. Also, nosotros set the appropriate message in the session variable, which will be displayed to users after redirection in theindex.php file.
How It All Works Together
Don't forget to create theuploaded_files directory and make it writable by thespider web-server user. Next, go ahead and run theindex.php file, which should display the file upload course which looks like this:
Click on theBrowse button—that should open a dialog box which allows you to select a file from your computer. Select a file with one of the extensions immune in our script, and click on theUpload button.
That should submit the form, and if everything goes well, you should see the uploaded file in theuploaded_files directory. You could likewise try uploading other files with extensions that are non allowed, and check if our script prevents such uploads.
Resolving Common Errors
A lot of things can become wrong during a file upload which might result in errors. Y'all can check the exact mistake that occurred during the upload using$_FILES['uploadedFile']['error']. Hither is the explanation of those errors:
File Is Too Large
UPLOAD_ERR_INI_SIZE andUPLOAD_ERR_FORM_SIZE occur when the size of an uploaded file is more than the value specified in php.ini or the HTML form respectively. You tin can get rid of this error past increasing the upload size limits or letting users know most them beforehand.
Temporary Folder Is Missing
UPLOAD_ERR_NO_TMP_DIR is reported when the temporary binder to upload the file is missing.UPLOAD_ERR_NO_FILE is reported when there is no file to upload.
Fractional Upload or Tin't Write to Deejay
You will getUPLOAD_ERR_PARTIAL if the file could only be uploaded partially andUPLOAD_ERR_CANT_WRITE if the file could not be written to the deejay.
A PHP Extension Stopped the File Upload
Sometimes, you will get the errorUPLOAD_ERR_EXTENSION considering some extension stopped the file upload. This one will crave more investigation past you to effigy out which extension caused the problem.
Here is the full code fromupload.php which will show users a bulletin on the upload folio in example of success or failure of the upload. The information about the success or failure of the upload is stored in the$_SESSION['message'].
<?php session_start(); $bulletin = ''; if (isset($_POST['uploadBtn']) && $_POST['uploadBtn'] == 'Upload') { if (isset($_FILES['uploadedFile']) && $_FILES['uploadedFile']['error'] === UPLOAD_ERR_OK) { // go details of the uploaded file $fileTmpPath = $_FILES['uploadedFile']['tmp_name']; $fileName = $_FILES['uploadedFile']['name']; $fileSize = $_FILES['uploadedFile']['size']; $fileType = $_FILES['uploadedFile']['type']; $fileNameCmps = explode(".", $fileName); $fileExtension = strtolower(terminate($fileNameCmps)); // sanitize file-name $newFileName = md5(time() . $fileName) . '.' . $fileExtension; // check if file has i of the following extensions $allowedfileExtensions = assortment('jpg', 'gif', 'png', 'nothing', 'txt', 'xls', 'doc'); if (in_array($fileExtension, $allowedfileExtensions)) { // directory in which the uploaded file will be moved $uploadFileDir = './uploaded_files/'; $dest_path = $uploadFileDir . $newFileName; if(move_uploaded_file($fileTmpPath, $dest_path)) { $message ='File is successfully uploaded.'; } else { $message = 'In that location was some error moving the file to upload directory. Please make sure the upload directory is writable by web server.'; } } else { $message = 'Upload failed. Allowed file types: ' . implode(',', $allowedfileExtensions); } } else { $bulletin = 'In that location is some mistake in the file upload. Please cheque the post-obit error.<br>'; $message .= 'Fault:' . $_FILES['uploadedFile']['error']; } } $_SESSION['message'] = $message; header("Location: index.php"); Learn PHP With a Gratuitous Online Grade
Today, we discussed the basics of file upload in PHP. In the first half of the article, nosotros discussed the dissimilar configuration options that need to exist in place for file upload to work. So we looked at a existent-earth instance which demonstrated how file upload works in PHP.
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In this course, you'll learn the fundamentals of PHP programming. You'll start with the nuts, learning how PHP works and writing uncomplicated PHP loops and functions. So you lot'll build up to coding classes for simple object-oriented programming (OOP). Along the way, you'll larn all the almost of import skills for writing apps for the web: you lot'll get a chance to practice responding to Become and POST requests, parsing JSON, authenticating users, and using a MySQL database.
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Source: https://code.tutsplus.com/tutorials/how-to-upload-a-file-in-php-with-example--cms-31763
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