Originariamente inviato da StefanoV
Con die puoi printare un messaggio di errore!

die("Errore");


con exit no!
exit();
non è vero.. puoi farlo sia con l'uno che con l'altro... rileggiti bene il manuale php

prendo lo stralcio esatto dal manuale:

die()

codice:
Manuale PHP 

die
die -- Equivalent to exit()
Description
This language construct is equivalent to exit().
e per exit():
codice:
 exit
(PHP 3, PHP 4, PHP 5 )

exit -- Output a message and terminate the current script
Description
void exit ( [string status])

void exit ( int status)


Nota: This is not a real function, but a language construct. 

Nota: PHP >= 4.2.0 does NOT print the status if it is an integer. 

The exit() function terminates execution of the script. It prints status just before exiting. 

If status is an integer, that value will also be used as the exit status. Exit statuses should be in the range 1 to 254, the exit status 255 is reserved by PHP and shall not be used. 

Esempio 1. exit() example

<?php

$filename = '/path/to/data-file';
$file = fopen($filename, 'r')
    or exit("unable to open file ($filename)");

?>