How can PHP developers protect their servers from potential security threats posed by malicious files uploaded by users?

To protect their servers from potential security threats posed by malicious files uploaded by users, PHP developers should validate file types, restrict file sizes, and store uploaded files in a secure directory outside the web root. 

// Validate file type
$allowedTypes = ['image/jpeg', 'image/png', 'image/gif'];
if (!in_array($_FILES['file']['type'], $allowedTypes)) {
    die('Invalid file type.');
}

// Restrict file size
$maxFileSize = 1048576; // 1MB
if ($_FILES['file']['size'] > $maxFileSize) {
    die('File size exceeds limit.');
}

// Store uploaded file in a secure directory
$uploadDir = '/path/to/secure/directory/';
$uploadFile = $uploadDir . basename($_FILES['file']['name']);
if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile)) {
    echo 'File uploaded successfully.';
} else {
    echo 'File upload failed.';
}

Keywords

File upload security threats PHP developers server protection malicious files.

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