Sunday, January 21, 2018

PHP Miscellaneous Function for BCA,B.Sc(IT),PGDCA,MCA,M.Sc(IT) and all IT Students


--------------------------------------------------------------------------------------------------------------------------
Prepared By  : Uday Shah (HOD - IT)
Contact No   : 7600044051
E-Mail          : rupareleducation@gmail.com


PHP Miscellaneous Function

No
Name
Description
1
Define()
It is used to define a named constant at runtime.
Syntax:
define(string $name,$value[,bool $case_insensetive=false]);
If it sets to true, the constant will be defined case insensitive. The default behavior is case sensitive.
It returns TRUE on success or FALSE on failure.
Example:
<?php
define(“CONSTANT”,”Hello World.”);
echo CONSTANT;    //output’s “Hello World”
echo Constant; //output’s “Constant” and issue a notice.
define(“GREETING”,”Hello you.”,true);
echo Greeting;           //output’s “Hello you”.
?>
2
Constant()
It returns the value of the constant indicated by name. Constant() is useful if you need to retrieve the value of a constant, but do not know its name.
·        It is stored in a variable or returned by a function.
·        This function works also with class constant.
·        Syntax: constant(string $name);
·        It returns the value of the constant or NULL if  the constant is not defined.
Example
<?php
define(“MAXSIZE”,100);
echo constant(“MAXSIZE”);
?>
3
include()
The include() statement includes and evaluates the specified file.
ð         The code it contains inherits the variable scope of the line on which the include occurs
ð         Any variable available at that line in the calling file will be available within the called file, from that point forward.
ð         Syntax: include(string ‘file-name’);
ð         The include function requires two file to execute.
Example
File1.php
<?php
          $color=’green’;
         $fruit=’apple’;
?>
File2.php
<?php
          include(“file1.php”);
          echo “A $color $fruit”;
?>
4
require()
Require() is identical to include() except upon failure it will produce a fatal error.
In other words , it will halt the script whereas include() only emits a warning which allows the script to continue.
5
header()
header is used to send a raw http header.
remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file.
It is a very common error to read code with include(), or require(), functions or another file access function and have spaces or empty lines that are output before header is called.
Syntax:
header(string $string[,int $http_response_code]);
Example
<?php
            header(‘URL’); 
?>
6
die()  or exit ()
The exit() function in PHP is an inbuilt function which is used to output a message and terminate the current script.

The exit() function only terminates the execution of the script. 


The shutdown functions and object destructors will always be executed even if exit() function is called.

The exit() function is an alias of the die() function.

Syntax
die(parameter)  or exit (Parameter)


<?php
$link = "https://www.rupareleducation.in";
   // opening a link
fopen($link, "r")
   //using exit() to display message and terminate script
or exit("Unable to establish a connection to $link");

?>

         
:: Best Of Luck :: 

Please Share and Comment it.... Thank You.