Php Basics

Basic PHP Syntax

PHP script is starts with <?php and ends with ?>. A PHP script can be placed anywhere in the document.
You can start a PHP script with <? and end with ?>.

A PHP file must have a .php extension.
A PHP file generally contains HTML tags, and some PHP scripting code.

The example below sends "How are you" string to browser.
<html>
<body>
<?php

echo "How are you";

?>
</body>
</html>
Each code line in PHP must end with a semicolon.

Comments in PHP

sinlge line comment : //
multiline comment : /* */

<?php
//This is a comment
/*
This is
a comment
block
*/
?>

PHP Variables

A variable can have a short name, like a, or a more descriptive name, like abc.
Remeber this for variable in php
  • Variables in PHP is start with a $ sign, followed by the name of the variable
  • The variable name must begin with a letter or the underscore character
  • Variable names are case sensitive (abc and ABC are two different variables)
  • A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
  • A variable name should not contain blank spaces

Declaring PHP Variable

<?php

$txt="Hello World!";

$x=16;

?>
Labels:
Subscribe to: Post Comments (Atom)