What are the potential issues or errors that may arise when using the file upload functionality in PHP?

One potential issue that may arise when using the file upload functionality in PHP is the lack of proper file type validation. This can lead to security vulnerabilities if malicious files are uploaded to the server. To solve this issue, you should always validate the file type before allowing the upload to proceed. 

// Check if the file type is allowed before uploading
$allowedTypes = ['image/jpeg', 'image/png', 'image/gif'];
if (!in_array($_FILES['file']['type'], $allowedTypes)) {
    die('Invalid file type. Only JPEG, PNG, and GIF files are allowed.');
}

// Proceed with file upload
// Your file upload code here...

Keywords

file upload PHP error handling security vulnerabilities file size limit

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