PHP is a server side language, PHP code is only executed on the server end, and return plain HTML result to the browser.
Basic PHP Syntax:
PHP scripting block starts with <?php and ends with ?>
<?php ?>
A PHP scripting block is allowed to be placed anywhere in a PHP document.
You can start a PHP scripting block with <? and ends it with ?>, but these shorthand is not recommended.
<?php
?>
A PHP file is allowed to contains some HTML tags, simply like an HTML file, as well as some PHP scripting code.
What you see below is a very simple PHP script, which return to the browser a text “Hello World”:
<html>
<body>
<?php
echo “Hello World”;
?>
</body>
</html>
Each line of code in PHP requires ending with a semicolon.The semicolon is somehow like a separator, it tells the server to distinguish one line of PHP scripting from another.
There are two statements for outputing PHP text: echo and print, as what you read, we have used echo statement to output the “Hello World” text.
Note:Your PHP file must have a .php extension, otherwise, the PHP code can not be executed.
Comments in PHP:
In PHP, there are two types of comments:
// for making a single-line comment, while /* and */ for large comment block.
<html>
<body>
<?php
// This is a comment
/*This is
a comment block
*/
?>
</body>
</html>
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