Question

我想在php 5中使用和OR語句，但它只是不工作，這個腳本有什麼問題。這是假設發射的錯誤，但它沒有。如果我刪除「||」（我認爲是OR語句），它會引發錯誤。

if($winner=="2" && $fteamscore>$steamscore){ 
$return['error'] = true; 
$return['msg'] = 'Wrong Score, You said you LOST but you are reporting that you WON.'; 
} 
if($winner=="3" && $fteamscore>$steamscore){ 
$return['error'] = true; 
$return['msg'] = 'Wrong Score, You said you WON but your are reporting that your OPPONENT won.'; 
} 
if($fteamscore<$steamscore && $winner=="3" || $winner=="2"){ 

Answer 1

您的括號內容不正確。試試這個：

($fteamscore<$steamscore) && ($winner=="3" || $winner=="2") 

沒有任何括號，「and」首先被評估。你的表情相當於：

(($fteamscore<$steamscore && $winner=="3") || $winner=="2") 

更多關於運算符優先級：http://en.wikipedia.org/wiki/Logical_connective#Order_of_precedence

Answer 2

也許你需要parens？

if($fteamscore<$steamscore && ($winner=="3" || $winner=="2")) { 

這種方式是，在括號表達式正在& &「之前評估ð由於操作者的優先級。