PHP Syntax

A PHP script is executed on the server, and the plain HTML result is sent back to the browser.

Basic PHP Syntax

A PHP script can be placed anywhere in the document.

A PHP script starts with :

// PHP code goes here
?>

The default file extension for PHP files is “.php”.

A PHP file normally contains HTML tags, and some PHP scripting code.

Below, we have an example of a simple PHP file, with a PHP script that uses a
built-in PHP function “echo” to output the text
“Hello World!” on a web page:

Example

My first PHP page

echo “Hello World!”;

?>

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Note: PHP statements end with a semicolon (;).

PHP Case Sensitivity

In PHP, NO keywords (e.g. if,
else, while,
echo, etc.), classes, functions,
and user-defined functions are case-sensitive.

In the example below, all three echo statements below are equal and legal:

Example

ECHO “Hello World!
“;

echo “Hello World!
“;

EcHo “Hello World!
“;

?>

Try it Yourself »

Note: However; all variable names are case-sensitive!

Look at the example below; only the first statement will display the value of the
$color variable! This is because
$color, $COLOR, and
$coLOR are treated as three
different variables:

Example

$color = “red”;

echo “My car is ” . $color . “
“;

echo “My house is ” . $COLOR . “
“;

echo “My boat is ” . $coLOR . “
“;

?>

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PHP Exercises

Source

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