PHP syntax basics:
- All keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive.
- All variable names are case-sensitive.
Example:
<!DOCTYPE html>
<html>
<body>
<h1>My first PHP page</h1>
<?php// single-line comment 1
# single-line comment 2
/* Multiple-lines comment - Line 1Multiple-lines comment - Line 2
Multiple-lines comment - Line 3
*/
echo "Hello World!";
?><?php
ECHO "Hello World!<br>";
echo "Hello World!<br>";
EcHo "Hello World!<br>";
?><?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>
</body>
</html>Note: PHP statements end with a semicolon (;).