What are common issues that arise when using a formmailer with file uploads in PHP?

One common issue that arises when using a formmailer with file uploads in PHP is the need to increase the maximum file size that can be uploaded. This can be done by adjusting the "upload_max_filesize" and "post_max_size" directives in the php.ini file. Additionally, it is important to validate the file type and size on the server side to prevent malicious uploads. 

// Increase maximum file size in php.ini
// upload_max_filesize = 20M
// post_max_size = 20M

// Validate file type and size
$allowedFileTypes = ['jpg', 'jpeg', 'png', 'gif'];
$maxFileSize = 10 * 1024 * 1024; // 10MB

if ($_FILES['file']['error'] == UPLOAD_ERR_OK) {
    $fileType = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION));
    $fileSize = $_FILES['file']['size'];

    if (!in_array($fileType, $allowedFileTypes) || $fileSize > $maxFileSize) {
        echo "Invalid file type or size.";
    } else {
        // Process file upload
    }
}

Keywords

formmailer file uploads PHP error handling security vulnerabilities

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