Upload png file in php

Upload a png file in php code example

Solution 2: This is checked twice because, the extension of the file and ‘file type’ can be differ, so someone can not upload executable file with .png extension. For example, in index.php you use , then attacker can upload image with PHP code inside and execute commands with smth like this: UPD: changed file in URL to page Solution 2: JPEG files can contain arbitrary data in them in addition to the actual image data; it’s part of the spec.

File upload in php for .JPG, .PNG Extensions

Here, this will help You (I hope)

if you mean you are having problems with uppercase extensions, then try converting the extension to lowercase in your conditions by using strtolower(), like:

. if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/jpg") || ($_FILES["file"]["type"] == "image/JPG") || ($_FILES["file"]["type"] == "image/pjpeg") || ($_FILES["file"]["type"] == "image/x-png") || ($_FILES["file"]["type"] == "image/png")) && ($_FILES["file"]["size"] < 20000) && in_array(strtolower($extension), $allowedExts)) < . //rest of your code 

 $temp = $_FILES["file"]["name"]; $valid_formats = array("jpg", "png", "gif", "bmp", "JPG", "PNG", "GIF", "BMP"); list($txt, $ext) = explode(".", $temp); if(in_array($ext,$valid_formats)) < if ($_FILES["file"]["error"] >0)< echo "Return Code: " . $_FILES["file"]["error"] . "
"; > else< echo "Upload: " . $_FILES["file"]["name"] . "
"; echo "Type: " . $_FILES["file"]["type"] . "
"; echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB
"; echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
"; if (file_exists("upload/" . $_FILES["file"]["name"])) < echo $_FILES["file"]["name"] . " already exists. "; >else < move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]); echo "Stored in: " . "upload/" . $_FILES["file"]["name"]; >> > else

Try this code it may help you.

How to upload file in php simple Code Example, “how to upload file in php simple” Code Answer’s. php upload file . php by Frantic Flamingo on Sep 13 2020 Donate

Upload script to allow only files with PNG extension

from the name of the image, get the extension and try to check the image uploaded based on the extension,

$imageName = $_FILES['userfile']['name']; $str=strpos($imageName,'.'); $ext=substr($imageName,$str+1,strlen($imageName)-$str-1); if($ext=='png') < if(move_uploaded_file($image[$i], $path.$imageName[$i])) < $result = $mysqli->query("INSERT INTO imageTable (imageName, imageCategory, imageSize, imageType) VALUES ('$imageName[$i]', '$imageCategory', '$imageSize[$i]' , '$imageType[$i]' )"); $melding = "Item is succesvol geupload!"; > > 

$ext = pathinfo($imageName, PATHINFO_EXTENSION); if($ext == "png")< if(move_uploaded_file($image[$i], $path.$imageName[$i])) < $result = $mysqli->query("INSERT INTO imageTable (imageName, imageCategory, imageSize, imageType) VALUES ('$imageName[$i]', '$imageCategory', '$imageSize[$i]' , '$imageType[$i]' )"); $melding = "Item is succesvol geupload!"; > > else

I believe this question has been answered numerous times on stack overflow, simply check the extension of the image and for a more secure site you may also want to check the exif data discussed in these pages below Only allow .jpg and .png files only How can I only allow certain filetypes on upload in php?

Upload code in php Code Example, All Languages >> PHP >> upload code in php “upload code in php” Code Answer’s. php upload file . php by Frantic Flamingo on Sep 13 2020 Donate -1 Source: www.tutorialspoint.com. php upload . php by Malario on Nov 03 2020 Donate . 0

PHP Validating the File Upload [duplicate]

You should pass the tmp_name of the file* to getimagesize, it will give you the size and type of the image (if it is an image). If the passed argument is a file but not an image it returns false, that will allow you to validate.

Edit: The only reliable method of image validation is to make a copy of it using GD or Imagick - getimagesize can be easily hacked.

*: I mean, the temporal file created after upload.

if ($_SERVER['REQUEST_METHOD'] === 'POST') < $file = $_FILES['file']['tmp_name']; if (file_exists($file)) < $imagesizedata = getimagesize($file); if ($imagesizedata === FALSE) < //not image >else < //image //use $imagesizedata to get extra info >> else < //not file >> 

This code uses file_exists just to be general. In case no file were uploaded you would get $_FILES['file']['size'] = 0 , $_FILES['file']['tmp_name'] = '' and $_FILES['file']['error'] = 4 . See also is_readable. For the error values see file upload errors explained at php.net.

$allowedExts = array("gif", "jpeg", "jpg", "png"); $extension = end(explode(".", $_FILES["file"]["name"])); if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/jpg") || ($_FILES["file"]["type"] == "image/png")) && ($_FILES["file"]["size"] < 20000) && in_array($extension, $allowedExts)) 

This is checked twice because, the extension of the file and 'file type' can be differ, so someone can not upload executable file with .png extension.

In your modified code, it is possible to upload a different type of file with modified extension. like they can upload word document with '.png' extension.

Your new code is just checking extension and don't have double check.

Your new code only checks the extension of the file and the size of the file. It doesn't checks the type of the file.

I will strongly recommend to use your old code because there it checks the file type also.

Create a transparent png file using PHP, 1) You can create a new png file without any existing one. 2) You get a black color image because you use imagecreatetruecolor();.It creates a highest quality image with a black background. Code sample$img = imagecreatetruecolor(200, 200);imagesavealpha($img, true);$color = imagecolorallocatealpha($img, 0, 0, 0, 127);imagefill($img, 0, 0, $color);imagepng($img, 'test.png');Feedback

My php site was hacked by codes uploaded as image.

Image file with arbitrary PHP code can't be exploited with direct request to it, e.g. http://www.mysite.com/uploads/image.jpg?cmd=somecode .

Still, it can be used with Local File Inclusion vulnerability.

For example, in index.php you use include('pages/' . $_GET['page'] . '.php'); , then attacker can upload image with PHP code inside and execute commands with smth like this: http://www.mysite.com/index.php?page=../upload/image.jpg?cmd=somecode%00

UPD: changed file in URL to page

JPEG files can contain arbitrary data in them in addition to the actual image data; it's part of the spec. Thus, merely checking if an image is a valid JPEG does not mean that the file is necessarily completely harmless.

This may not be a vulnerability in your code. I had the same thing happen to me a few weeks ago. Although ALL my index.php files were removed, even ones not directly web accessible. In my case, it was a security hole in Linux. Not anything to do with my code. This was the reply from my hosting provider (A2Hosting), regarding the problem. Once I convinced them it wasn't anything I did, they figure things out pretty quickly.

"A recent exploit in the Linux kernel was used to grant administrative (root) access to users' directories on the server. The attack consisted of removing index files found in directories and replacing them with the attacker's desired content: A black web page with the attacker's code name, "iSKORPiTX (Turkish Hacker)". This hack was massive across the internet and used a previously unknown vulnerability, limiting our ability in preventing it."

How to recieve an image (file) with PHP that was, If you want to upload using a mobile app for example, you have to send via POST the base64 content of the image with the mimetype or the file extension of it, and then use something like this:

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PHP File Upload

However, with ease comes danger, so always be careful when allowing file uploads!

Configure The "php.ini" File

First, ensure that PHP is configured to allow file uploads.

In your "php.ini" file, search for the file_uploads directive, and set it to On:

Create The HTML Form

Next, create an HTML form that allow users to choose the image file they want to upload:

Some rules to follow for the HTML form above:

• Make sure that the form uses method="post"
• The form also needs the following attribute: enctype="multipart/form-data". It specifies which content-type to use when submitting the form

Without the requirements above, the file upload will not work.

• The type="file" attribute of the tag shows the input field as a file-select control, with a "Browse" button next to the input control

The form above sends data to a file called "upload.php", which we will create next.

Create The Upload File PHP Script

The "upload.php" file contains the code for uploading a file:

$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
> else echo "File is not an image.";
$uploadOk = 0;
>
>
?>

• $target_dir = "uploads/" - specifies the directory where the file is going to be placed
• $target_file specifies the path of the file to be uploaded
• $uploadOk=1 is not used yet (will be used later)
• $imageFileType holds the file extension of the file (in lower case)
• Next, check if the image file is an actual image or a fake image

Note: You will need to create a new directory called "uploads" in the directory where "upload.php" file resides. The uploaded files will be saved there.

Check if File Already Exists

Now we can add some restrictions.

First, we will check if the file already exists in the "uploads" folder. If it does, an error message is displayed, and $uploadOk is set to 0:

// Check if file already exists
if (file_exists($target_file)) echo "Sorry, file already exists.";
$uploadOk = 0;
>

Limit File Size

The file input field in our HTML form above is named "fileToUpload".

Now, we want to check the size of the file. If the file is larger than 500KB, an error message is displayed, and $uploadOk is set to 0:

// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) echo "Sorry, your file is too large.";
$uploadOk = 0;
>

Limit File Type

The code below only allows users to upload JPG, JPEG, PNG, and GIF files. All other file types gives an error message before setting $uploadOk to 0:

Complete Upload File PHP Script

The complete "upload.php" file now looks like this:

$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
> else echo "File is not an image.";
$uploadOk = 0;
>
>

// Check if file already exists
if (file_exists($target_file)) echo "Sorry, file already exists.";
$uploadOk = 0;
>

// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) echo "Sorry, your file is too large.";
$uploadOk = 0;
>

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
> else if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.";
> else echo "Sorry, there was an error uploading your file.";
>
>
?>

Complete PHP Filesystem Reference

For a complete reference of filesystem functions, go to our complete PHP Filesystem Reference.

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