PHP if else 实例 - 自学教程(runoops.com)

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP if else 实例 - 自学教程(runoops.com)</title>
</head>
<body>
​
<?php
$t=date("H");
if ($t<"10"){
    echo "Have a good morning!";
}elseif ($t<"20"){
    echo "Have a good day!";
}else{
    echo "Have a good night!";
}
?>
​
</body>
​
</html>