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I am looking forward to learn PHP- Hypertext Preprocessor for server side scripting. But before starting with it I need help to understand following concepts of PHP.
- What are PHP Arrays?
- What are PHP Cookies?
- What PHP Files contain?
Please provide some valid information on the above topics as well as provide some examples.
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Similar to ASP(Active Server Pages), PHP is also a scripting language on the Server side. Thus the scripts in PHP are to be processed on the server side. The PHP files contain HTML tags, the scripts and the text as well. Thus, the PHP files are submitted as plain HTML to the browser.
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PHP supports three different types of arrays:
- The Associative array,
- The Numeric array and
- The Multidimensional array.
As the basic definition of arrays in any programming language it is used to hold multiple values all stored in a single array variable.
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Cookie is a file stored on the host(client) machine by the server to identify the user when the user visits that web site. For PHP we can create and set the cookie using the setcookie() function. The syntax of the setcookie() is as follows:
eg:setcookie(name, value, expire, path, domain);
Code:setcookie("host", "Adam", time()+7200);
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For an Associative array of PHP value is associated to every ID Key. The very main characteristic of Associative array is that it allows the programmer to use values as keys.Thus, permitting the programmers to assign values to them.
The above line of code is used to assign salary.Code:$sal = array("Ram"=>10000, "Ravi"=>15000, "Clint"=12000);
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The above PHP code is useful in finding if the cookie is set or not. For this purpose we can make use of the isset() function. You can also delete a cookie in the following manner:Code:<html> <body> <?php if (isset($_COOKIE["client"])) echo "Hello " . $_COOKIE["user"] . "!<br />"; else echo "Hello Client!<br />"; ?> </body> </html>
Code:<?php setcookie("client", "", time()-1800); ?>
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