What are the potential pitfalls of using PHP to control image display based on time?

One potential pitfall of using PHP to control image display based on time is that the server time may not be synced with the user's local time, leading to incorrect image display. To solve this issue, you can use JavaScript to get the user's local time and then send it to the server for comparison. 

// PHP code to control image display based on user's local time
<?php
// Get user's local time using JavaScript
echo '<script>var userTime = new Date().getTimezoneOffset();</script>';

// Send user's local time to server for comparison
echo '<script>$.ajax({
        type: "POST",
        url: "compareTime.php",
        data: { userTime: userTime },
        success: function(response) {
            if(response == "day"){
                echo '<img src="dayImage.jpg" alt="Day Image">';
            } else {
                echo '<img src="nightImage.jpg" alt="Night Image">';
            }
        }
    });</script>';
?>

Keywords

PHP image display time-based caching performance

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