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what are the differences in die() and exit() in PHP?

I am totally confused in the difference of die and exit.

Most programmers use die like this.

$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');  //don't see mysql_* problem it is just example
if (!$link) {
    die('Could not connect: ' . mysql_error());
}

and using exit like this

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

According to there functionality , I don’t think so there is any difference because both terminates the execution of the script.

My question is

1) Can I interchange die with exit and vice-versa in these examples?

2) And the difference between these also.

Cheers…

Answer 1

According to Die it is Equivalent to exit. So yes, you can interchange them .