exit() function in PHP

The exit() function in PHP prints a message and terminates the current script execution immediately. It can accept an optional message parameter to display before exiting.

Syntax

exit(msg)

Parameters

• msg − Optional. The message to display before exiting the script. Can be a string or an integer exit status code.

Return Value

The exit() function does not return any value as it terminates script execution.

Example 1: Basic Usage

Here's a simple example showing how exit() works −

<?php
    echo "Before exit";
    exit("Script terminated!");
    echo "This line will never execute";
?>

Before exit
Script terminated!

Example 2: File Operation with Error Handling

The exit() function is commonly used for error handling when operations fail −

<?php
    $url = "https://www.example.com/";
    fopen($url, "r") 
    or exit("Can't connect!");
    echo "Connection successful!";
?>

Can't connect!

Example 3: Using Exit Status Code

You can also pass an integer exit status code instead of a message −

<?php
    $condition = false;
    if (!$condition) {
        exit(1); // Exit with error status code 1
    }
    echo "This won't be displayed";
?>

Conclusion

The exit() function is essential for controlling script flow and handling errors. Use it to terminate execution when critical errors occur or when certain conditions are not met.