PHP Syntax
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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