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You cannot view the PHP source code by
selecting "View source" in the browser - you will only see the
output from the PHP file, which is plain HTML. This is because
the scripts are executed on the server before the result is sent
back to the browser.
Basic PHP Syntax
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 ?>.
However, for maximum compatibility, we recommend that you use
the standard form (<?php) rather than the shorthand form.
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>
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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".
Comments in PHP
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>
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