，爲什麼不正確運行？

Question

<select name="filtering"> <option value="a">a</option> <option value="b">b</option>

if (isset($_POST['filtering']) == "a") { 
    $stmt = prepare("SELECT * FROM user_posts ORDER BY post_time DESC LIMIT :limit OFFSET :offset"); 
} 

if (isset($_POST['filtering']) == "b") { 
    $stmt = prepare("SELECT * FROM user_posts ORDER BY post_time ASC LIMIT :limit OFFSET :offset"); 
} 

Answer 1

Isset只會返回true或false

if (isset($_POST['filtering'])&&($_POST['filtering']=="a")){ 
    $stmt = prepare("SELECT * FROM user_posts ORDER BY post_time DESC LIMIT :limit OFFSET :offset"); 
} 

if (isset($_POST['filtering'])&&($_POST['filtering']=="b")) { 
    $stmt = prepare("SELECT * FROM user_posts ORDER BY post_time ASC LIMIT :limit OFFSET :offset"); 
}