What are common pitfalls when handling image file extensions in PHP?

One common pitfall when handling image file extensions in PHP is not properly validating the file extension before processing the image. This can lead to security vulnerabilities such as allowing malicious files to be uploaded and executed on the server. To solve this issue, always validate the file extension against a list of allowed extensions before processing the image. 

// Example code snippet to validate image file extensions

$allowed_extensions = array('jpg', 'jpeg', 'png', 'gif');
$file_extension = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);

if (!in_array($file_extension, $allowed_extensions)) {
    // Invalid file extension, handle error accordingly
    die('Invalid file extension. Only JPG, JPEG, PNG, and GIF files are allowed.');
}

// Process the image file
// Add your image processing code here

Keywords

file extensions image handling PHP MIME types validation

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