Difference between die() and exit() functions in PHP

PHP exit() Function: In PHP, the exit() function prints a message and exits the application. It's often used to print a different message in the event of a mistake. Use exit() when there is not an error and have to stop the execution.

Syntax:

exit("Message goes here");
or
exit();

Example:

exit("This request is processed");

Program 1:

<?php
   exit ("This is an exit function in php");
   echo "This will not printed because "
    . "we have executed exit function";
?>

Output:

This is an exit function in php

Program 2:

<?php
  $a = 10;
  $b = 10.0;
  if($a == $b) {
    exit('variables are equal');
  }
  else {
    exit('variables are not equal'); 
  }
?>

Output:

variables are equal

PHP die() Function: In PHP, die() is the same as exit(). A program's result will be an empty screen. Use die() when there is an error and have to stop the execution.

Syntax:

die("Message goes here"); 
or 
die();

Example:

die('Oops! Something went wrong');

Program:

<?php
    $num = 1;

    // die can only print string values,
    // hence there will be no output
    die($num);
?>

Output:

No Output

Note: The output for the above program will be an empty screen because it is similar to exit(), die() can print only string values.

Differences between die() and exit() Functions: