A PHP Syntax script is executed on the server, and the plain HTML result is sent back to the browser. It can be placed anywhere in the document. It 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 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>
PHP Case Sensitivity
In PHP, keywords (e.g. if
, else
, while
, echo
, etc.), classes, functions, and user-defined functions are not case-sensitive. In the example below, all three echo statements below are equal and legal:
<!DOCTYPE html> <html> <body> <?php ECHO "Hello World!<br>"; echo "Hello World!<br>"; EcHo "Hello World!<br>"; ?> </body> </html>
In this example 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:
<!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>
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