Basic PHP Syntax A PHP script can be placed anywhere in the document. A PHP script starts with <?php and ends with ?>
<!DOCTYPE html>
<html>
<body>
<h1>My first page</h1>
<?php
echo "Hello World !";
?>
</body>
</html>
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 legal (and equal):
Comments in PHP
A comment in PHP 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
However; all variable names are case-sensitive.
In 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):
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