PHP Syntax

PHP Tutorial » PHP Syntax

A PHP script can be placed anywhere in HTML code and starts with: <?php cod php ?> :

Syntax of PHP:

<?php
// PHP code is placed here
?>

my_file.php - The default file extension for PHP files is ".php".

Below, we make an example of a simple PHP file, with a PHP code that uses a function "echo" to output the text "Hello, how are you doing?" on a web page:

Example: a simple PHP file inside HTML code

<!DOCTYPE html>

<html>

<body>



<h1>My first PHP page</h1>



<?php

echo "Hello, how are you doing?";

?>



</body>

</html>

Note: PHP statements end with ";" (semicolon without qutes).

PHP Case-Sensitivity, example

In PHP, keywords as: echo, if, else, while, etc. classes, functions, and user-defined functions are not case-sensitive..

Example: not case-sensitive.

  <!DOCTYPE html>

    <html>

    <body>

    

    <?php

    ECHO "Hello, how are you doing?<br />";

    echo "Hello, how are you doing?<br />";

    EcHo "Hello, how are you doing?<br />";

    ?>

    

    </body>

    </html>

PHP variable names are case-sensitive

All variable names are case-sensitive.

Example: case-sensitive.

<!DOCTYPE html>

<html>

<body>



<?php

$color = "white";

echo "My big boat is ". $color ."<br />";

echo "My little house ". $COLOR ."<br />";

echo "My little house is ". $coLOR ."<br />";

?>



</body>

</html>

Variable name rules:

In PHP, variables start with the $ sign followed by the variable name;
The name must begin with the "_" character or a letter;
The name CANNOT start with a digit;
The name can contain alphanumeric characters and underscores;
Variable names are case-sensitive ($age is not the same as $AGE, but they are different variables)

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PHP Syntax - php tutorial

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