This entry is part 3 of 3 in the series PHP

Basic PHP 7 Syntax

Read previous part here. before proceeding to PHP 7 Syntax

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

A script can be placed anywhere in the document.

A script starts with <?php and ends with ?>:

<?php
// 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(for Basic PHP 7 Syntax) 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:

<!DOCTYPE html>
<html>
<body>

<h1>My first PHP page</h1>

<?php
echo "Hello World!";
?>

</body>
</html>

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

Comments in PHP

A comment in code is a line that is not read/executed as part of the program. Its only purpose is to be read by someone who is looking at the code.

Comments can be used to:

  • Let others understand what you are doing
  • Remind yourself of what you did – Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did. Comments can remind you of what you were thinking when you wrote the code

PHP supports several ways of commenting:

<!DOCTYPE html>
<html>
<body>

<?php
// This is a single-line comment

# This is also a single-line comment

/*
This is a 
multiple-lines 
comment block
*/

// You can also use comments to leave out parts of a code 
$a = 35 /* + 105 */ + 65;
echo $a;
?>

</body>
</html>

PHP Case Sensitivity

In PHP, keywords (e.g. ifelsewhileecho, etc.), classes, functions, and user-defined functions are Not case-sensitive.

In below example , all three echo statements below are equal:

<!DOCTYPE html>
<html>
<body>

<?php
ECHO "Hello World!<br>";
echo "Hello World!<br>";
EcHo "Hello World!<br>";
?>

</body>
</html>

However; all variable names are case-sensitive.

In below example, only the first will display the value of the $color variable (this is because $color, $COLOR, and $coLOR are treated as three different variables):

<!DOCTYPE html>
<html>
<body>

<?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>

</body>
</html>

Result:-

My car is red
My house is 
My boat is 

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Aakash Kothari

I am Freelancer Developer In PHP , Web Design, And Android Development.

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