functions and its types in php

Functions And Its Types In Php

PHP Functions :

The real power of PHP comes from its functions. In PHP - there are more than 700 built-in functions available.

PHP Functions :

In this tutorial we will show you how to create your own functions.

Create a PHP Function :

A function is a block of code that can be executed whenever we need it. Creating PHP functions:

All functions start with the word "function()"

Name the function - It should be possible to understand what the function does by its name. The name can start with a letter or underscore (not a number)

Add a "{" - The function code starts after the opening curly brace

Insert the function code

Add a "}" - The function is finished by a closing curly brace

Example : A simple function that writes my name when it is called:

CODE/PROGRAM/EXAMPLE

<html>
<body>
<?php
function writeMyName()
{
echo "Kai Jim Refsnes";
}
writeMyName();
?>
</body>
</html>

Use a PHP Function :

Now we will use the function in a PHP script:

CODE/PROGRAM/EXAMPLE

<html>
<body>
<?php
function writeMyName()
{
echo "Kai Jim Refsnes";
}
echo "Hello world!<br />";
echo "My name is ";
writeMyName();
echo ".<br />That is right, ";
writeMyName();
echo " is my name.";
?>
</body>
</html>

//  O/P : Hello world!
    My name is Kai Jim Refsnes.
    That is right, Kai Jim Refsnes is my name.

PHP Functions - Adding parameters :

Our first function (writeMyName()) is a very simple function. It only writes a static string. To add more functionality to a function, we can add parameters. A parameter is just like a variable.

You may have noticed the parentheses after the function name, like: writeMyName(). The parameters are specified inside the parentheses.

Example 1 The following example will write different first names, but the same last name:

CODE/PROGRAM/EXAMPLE

<html>
<body>
<?php
function writeMyName($fname)
{
echo $fname . " Refsnes.<br />";
}
echo "My name is ";
writeMyName("Kai Jim");
echo "My name is ";
writeMyName("Hege");
echo "My name is ";
writeMyName("Stale");
?>
</body>
</html>

//  O/P : My name is Kai Jim Refsnes.
    My name is Hege Refsnes.
    My name is Stale Refsnes.

Example 2 : The following function has two parameters:

CODE/PROGRAM/EXAMPLE

<html>
<body>
<?php
function writeMyName($fname,$punctuation)
{
echo $fname . " Refsnes" . $punctuation . "<br />";
}
echo "My name is ";
writeMyName("Kai Jim",".");
echo "My name is ";
writeMyName("Hege","!");
echo "My name is ";
writeMyName("Ståle","...");
?>
</body>
</html>

//  O/P : My name is Kai Jim Refsnes.
    My name is Hege Refsnes!
    My name is Ståle Refsnes...

PHP Functions - Return values :

Functions can also be used to return values.

CODE/PROGRAM/EXAMPLE

//Example
<html>
<body>
<?php
function add($x,$y)
{
$total = $x + $y;
return $total;
}
echo "1 + 16 = " . add(1,16)
?>
</body>
</html>

//  O/P : 1 + 16 = 17

#functions_and_its_types_in_php #functions_in_php #PHP_Functions #Create_a_PHP_Function #Use_a_PHP_Function #PHP_Functions_Adding_parameters #PHP_Functions_Return_values

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