05.Boolean Variable

<!doctype html>
<html>
<head>
    <title>05.Boolean Variable</title>
        <meta charset="utf8"/>
</head>
<body>
<h2>Choose your sex:</h2>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="get">
    <select name="sex">
        <option value="male">male</option>
        <option value="female">female</option>
    </select>
    <input type="submit" name="send" value="OK">
</form>
<?php
if(isset($_GET['send'])){
$sex = $_GET['sex'];
$question = "Are you female?";
    if($sex=='male'){
        echo "$question - False.You are $sex.<br/>";
    }
    else{
        echo "$question - True.You are $sex.<br/>";
    }
}
?>
</body>
</html>