How can PHP developers avoid mixing client-side logic with server-side logic when handling file uploads?

To avoid mixing client-side logic with server-side logic when handling file uploads, PHP developers can ensure that all file validation and processing is done on the server-side only. This means that any checks on file type, size, and other attributes should be performed in the PHP script handling the upload, rather than relying on client-side JavaScript. By keeping all file handling logic on the server-side, developers can ensure a more secure and reliable file upload process. 

if ($_FILES['file']['error'] === UPLOAD_ERR_OK) {
    $fileType = $_FILES['file']['type'];
    $fileSize = $_FILES['file']['size'];

    // Perform server-side validation on file type and size
    if ($fileType === 'image/jpeg' && $fileSize < 1000000) {
        $uploadPath = 'uploads/' . $_FILES['file']['name'];
        move_uploaded_file($_FILES['file']['tmp_name'], $uploadPath);
        echo 'File uploaded successfully!';
    } else {
        echo 'Invalid file type or size.';
    }
} else {
    echo 'Error uploading file.';
}

Keywords

PHP file uploads client-side logic server-side logic separation of concerns

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