<?php
//
?>

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

<?php
// 这是单行注释
#这也是单行注释
/*
这是多行注释块
它横跨多行
*/
?>

<?php
echo "<h2>PHP is fun!</h2>";
echo "Hello world!<br>";
echo "I'm about to learn PHP!<br>";
echo "This", " string", " was", " made", " with multiple parameters.";
?>
<?php
print "<h2>PHP is fun!</h2>";
print "Hello world!<br>";
print "I'm about to learn PHP!<br>";
//该行出错，因为print只能输出1个字符串
print "This", " string", " was", " made", " with multiple parameters.";
?>

<?php
//36
echo 12*3;
?>

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

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