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Showing posts with label function in php. Show all posts
Showing posts with label function in php. Show all posts

argument passed by reference

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By default arguments are passed by value(so that it will changed inside function only not outside the function).So we are going the value then send value by reference,prepend by (&) to the argument name in the function definition.
Syntax
function fun_name(&$varname)
Example

<?php
function my(&$num)
{
$num='welcome';
}
$str="welcome";
my($str);
echo $str;

?>


Output


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passing arguments

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Information may be passed to function via the argument list.which is a comma-delimited list of expression
Example

<?php
function my($num)
{
echo "$num";
}
my("india");
?>


Output

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PHP Cookies

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PHP Cookies
A cookie is often used to identify a user.
What is a Cookie?
A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.
How to Create a Cookie?
The setcookie() function is used to set a cookie.
Note:
          The setcookie() function must appear BEFORE the <html> tag. 
 Syntax
setcookie(name, value, expire, path, domain);
Example
In the example below, we will create a cookie named "user" and assign the value "Alex Porter" to it. We also specify that the cookie should expire after one hour:

<?php
setcookie("user", "Alex Porter", time()+3600);
?>
Note:
The value of the cookie is automatically URLencoded when sending the cookie, and automatically decoded when received (to prevent URLencoding, use setrawcookie() instead).

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PHP Functions with Return values

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PHP Functions - Return values
Functions can also be used to return values.

Example

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


The output of the code above will be:

1 + 16 = 17

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php functions with multiple parameters

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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:

<html>
<body>
<?php
function writeMyName($fname)
{
echo $fname . " Refsnes.";
}
echo "My name is ";
writeMyName("Kai Jim");
echo "My name is ";
writeMyName("Hege");
echo "My name is ";
writeMyName("Stale");
?>
<body>
</html>
The output of the code above will be:
My name is Kai Jim Refsnes.
My name is Hege Refsnes.
My name is Stale Refsnes.

Example 2

The following function has two parameters:

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

The output of the code above will be:
My name is Kai Jim Refsnes.
My name is Hege Refsnes!
My name is Ståle Refsnes...

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function in php

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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.
For a reference and examples of the built-in functions.
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

Use a PHP Function
Now we will use the function in a PHP script:

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


The output of the code above will be:

Hello world!
My name is Kai Jim Refsnes.
That's right, Kai Jim Refsnes is my name.

More about Function
Function with multiple parameter
Function with return value

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