Error message box in PHP
PHP doesn’t support alert message box because it is a server-side language but you can use JavaScript code within the PHP body to alert the message box on the screen.
PHP program to pop up an alert box on the screen.
<?php
// PHP program to pop an alert
// message box on the screen
// Display the alert box
echo '<script>alert("Welcome to Geeks for Geeks")</script>';
?>
Output
PHP program to pop up an alert box on the screen.
<?php
// PHP program to pop an alert
// message box on the screen
// Function definition
function function_alert($message) {
// Display the alert box
echo "<script>alert('$message');</script>";
}
// Function call
function_alert("Welcome to Geeks for Geeks");
?>
Output