From http://www.w3schools.com (Copyright Refsnes Data)
PHP code is executed on the server, and the plain HTML result is sent to the browser.
A PHP scripting block always starts with <?php and ends with ?>. A PHP scripting block can be placed anywhere in the document.
On servers with shorthand support enabled you can start a scripting block with <? and end with ?>.
For maximum compatibility, we recommend that you use the standard form (<?php) rather than the shorthand form.
<?php ?> |
A PHP file normally contains HTML tags, just like an HTML file, and some PHP scripting code.
Below, we have an example of a simple PHP script which sends the text "Hello World" to the browser:
<html> <body> <?php echo "Hello World"; ?> </body> </html> |
Each code line in PHP must end with a semicolon. The semicolon is a separator and is used to distinguish one set of instructions from another.
There are two basic statements to output text with PHP: echo and print. In the example above we have used the echo statement to output the text "Hello World".
Note: The file must have the .php extension. If the file has a .html extension, the PHP code will not be executed.
In PHP, we use // to make a single-line comment or /* and */ to make a large comment block.
<html> <body> <?php //This is a comment /* This is a comment block */ ?> </body> </html> |
From http://www.w3schools.com (Copyright Refsnes Data)