How to Alert Message Using PHP

1. Pop-Up Alert Message Taking Value From PHP Variable and JavaScript
2. Pop-Up Alert Message Using PHP Function JavaScript
3. Pop-Up Alert Message Using an Array or an Object

PHP does not have any built-in function for popping alert messages, but we can pop alert messages in PHP using JavaScript. The alert messages are shown in pop-up boxes in the browser, usually used for popping warning messages.

JavaScript helps PHP to show dynamic alert messages in the pop-up box. This tutorial demonstrates how we can use PHP and JavaScript to pop-up alert messages.

Pop-Up Alert Message Taking Value From PHP Variable and JavaScript

To pop-up alert messages in PHP is to put the variable into the javascript alert() method.

Example:

<?php
// Sending Alert message using PHP variable.
$alert = "This is DEMO WARNING";
echo "<script type='text/javascript'>alert('$alert');</script>";
?>

The above code will pop up an alert box in the browser showing the value of the $alert variable.

Output:

Pop-Up Alert Message Using PHP Function JavaScript

We can create a PHP function for popping the alert messages.

Example:

<?php
// Sending alert messages using PHP function
$message1= "This is the PHP function alert 1";
$message2= "This is the PHP function alert 2";
function alert($message) {
    echo "<script type='text/javascript'>alert('$message');</script>";
}
alert($message1);
alert($message2);
?>

This code will pop up a second alert message once you press the “ok” button on the first alert message.

Output:

Pop-Up Alert Message Using an Array or an Object

We can also use an array or an object instead of a variable to print in an alert box.

Example:

<?php
$alert = ["this", "is", "a", "demo", "warning"];
?>
<script>
var JavaScriptAlert = <?php echo json_encode($alert); ?>;
alert(JavaScriptAlert); // Your PHP alert!
</script>

json_encode() is a built-in PHP function that converts the array or an object to a simple JSON value.

Output:

The alert() function is compatible with every major browser.