What are the limitations of using PHP datetime picker for older browsers like IE 4?

The limitations of using PHP datetime picker for older browsers like IE 4 include lack of support for modern JavaScript features and potential compatibility issues. To solve this, you can use a polyfill or fallback method to ensure that the datetime picker functionality works properly in older browsers.

// Check if the browser is IE 4 or lower
if(preg_match('/MSIE\s([0-4]\.\d+);/', $_SERVER['HTTP_USER_AGENT'])) {
    // Use a polyfill or fallback method for datetime picker
    // For example, you can use a simple text input field for date input
    echo '<input type="text" name="date" placeholder="YYYY-MM-DD">';
} else {
    // Use the PHP datetime picker for modern browsers
    echo '<input type="date" name="date">';
}