PHP 变量
前提条件，本地机器作为服务器启动，输入下面的命令行。
php -S localhost:4000
1.site.php
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<?php
$characterName = "John";
$characterAge=35;
echo "There once was a man named $characterName<br>";
echo "He was $characterAge years old<br>";
echo "He really liked the name $characterName<br>";
echo "But did not like the age being $characterAge<br>";
?>
</body>
</html>
2.
http://localhost:4000/www/site.php