Function of PHP Exit and Die

Mission of this functions is ended working programs. The biggest difference between die function and exit is you can show a message when a program ended by die function.

For Example:
<?php

if($a==10)
{
die("Program was ended");
} else
{
echo "program is continueing"
}


?>


In here, program will be ended because of $a=10 and it will bring string from function of die. If we want to make same example in exit :

<?php


$a=10;
 if($a==10)
{
echo "Program was ended";
 exit();
} else{

echo "Program  is continueing." ;
}

?>


As you see, we have to write echo function. For this reason, we prefer die function. For example, if you have a problem in connection to database, you can show a warning message and you can stop the connection.

Environmental Variables (SERVER FUNCTIONS)

CONTENT_LENGTH : It takes information about POST method from FORM.

DOCUMENT_ROOT : It keeps path.

HTTP_COOKIE : It is variable which keeps cookies .

HTTP_HOST : Host name or Host adress .