March 18, 2009

Basic PHP Syntax

* The word PHP stands for HyPertext Preprocessor. PHP is an open source software and free to use. This is a server side scripting language which means codes written in php are executed on server side.

* All PHP code block starts with <?php and ends with ?>. You can also use <script language="php"> </script>

* If shorthand support is enabled on the server then you can start a PHP scripting block with <? and end with ?>. Short tag are enabled via the short_open_tag php.ini configuration file directive, or if php was configured with the --enable-short-tags option.

* Each code line in PHP must end with a semicolon (;). Semicolon differentiates between two instructions.

* In PHP, with echo or print command you can show output text.A php file can contain html tags just like a normal html file.

* Note that the closing tag of a PHP block at the end of a file is optional.

* Two types of commenting code in php script is available. For single line comment use "//". To comment a large block write code inside /* and */


Below is an example of welcome.php.


<html>
<body>
<?php
echo "Welcome to the PHP World";?>
<br> </br>
</body>
</html>
<?php
echo "Welcome php";
?>


Save welcome.php inside htdocs folder (If you use apache web server) and run it from browser. The following will be output.


Welcome to the PHP World

Welcome php
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