Describe how to create a simple AD rotator script without using database in PHP

Following are the steps to create a simple AD rotator script without using database in PHP:-
All the ad’s can be collected in one place and be displayed randomly.rand() function can be used for this purpose.

• In order to NOT use any database, a flat file can be used to store the ad’s.
• In order to store the Ad’s information (HTML code), a flat file say “ad.txt” can be created.
• The random number can be stored in a variable 
• $result_random=rand(1, 100);
• Conditions can be checked to display the ad’s.
• if($result_random<=70)
• {
•       echo "Display ad1";
• }

First create a text file with ads.txt extension. Each ad has its unique HTML code. For example :

<a href="http://www.mysite.com">Demo Text Link</a>

Write a function to handle ads. Example :

<?php

// Function to display random ads from a list 

function showRandomAD($ADnumber = 1){

// Loading the ad list into an array

$adList = file('ads.txt');

// Check the total number of ads

$numberOfADs = sizeof($adList);

// Initialize the random generator

list($usec, $sec) = explode(' ', microtime());

srand((float) $sec + ((float) $usec * 100000));

// Initialize the ads counter

$adCount = 0;

// Loop to display the requeste number of ads

while ($adCount++ < $ADnumber) {

// Generate random ad id

$actAD = rand(0, $numberOfADs-1);

// Display the above generated ad from the array

echo $adList[$actAD].'<br/>';

}

}

?>

All the lines from the file is stored in the array.

The function srand() selects the adds randomly from the array.

Create a simple php file and ember the statement <?php showRandomAD(3); ?> to demonstrate the use of rotator ad.