PHP Misc function
1- define()

Defines a constant value. you can use this constant value to any of the webpage.

Note :- For use constant value. First include page where you define your constant

Return Type :- bool

<?php
define("CONSTANT", "Hello world.");
echo CONSTANT."<br>";
echo Constant."<br>";
define("GREETING", "Hello you.", true);
echo GREETING."<br>";
echo Greeting."<br>";
?>

output:-
Hello world.
Constant
Hello you.
Hello you.

2- defined()

This function checks your constant is exists or not.

Return Type :- bool

<?php
if (defined('CONSTANT'))
{
echo CONSTANT;
}
?>

output
Hello world.

3- die()


die() funtion stop the execution of the current script and print message also.

Note :- This function is construct by language. This function is equivalent to exit().

<?php
$con=mysql_connect('localhost','root','1234');
if(!$con)
die('Mysql not connected');
?>

output
Mysql not connected

Some Other usefull Misc function(Brief discussion)

exit() :- Working same as die function. This is not real function. This is constuct by language. Return type (int)

eval() :- evaluates the string.

Return type (mixed)

constant() :- Return the value of the constant. Return type (mixed)


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