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PHP code is executed on the server, and the plain HTML result is sent 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 ?>.
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.
*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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