PHP抵消錯誤

Question

我遇到了一個PHP錯誤，通過我所有的互聯網scrummaging - 我一直無法破解。

錯誤說：

Error message Notice: Undefined offset: 3 in include() (line 89 of /home/devced/public_html/site/sites/all/themes/cedncsu/page.tpl.php).

所以，看在我的代碼，我現在有（實際使用下面的註釋）：

<?php 
    // Get Base URL 
    global $base_url; 

    // Get the Page's Parent Menu Item 
    $menuParent = menu_get_active_trail(); 

    // Since it returns an array, make sure to target what you are looking for 
    // You should print_r what menu_get_active_trail() to see what else it gives you 
    $menuParent = $menuParent[1]['link_title']; 
    $menuParent = strtolower(str_replace(" ", "-", $menuParent)); 
    $menuParent = preg_replace('/[^\w\d_ -]/si', '', $menuParent); 

    // Generate class specific for department page headers 
    $menuParentDepartment = menu_get_active_trail(); 
    $menuParentDepartment = $menuParentDepartment[3]['link_title']; // This is where they say the error is 
    $menuParentDepartment = strtolower(str_replace(" ", "-", $menuParentDepartment)); 
    $menuParentDepartment = preg_replace('/[^\w\d_ -]/si', '', $menuParentDepartment); 

    // Current Page space replace/lowercase 
    $currentTitle = strtolower(str_replace(" ", "-", $title)); 
    $currentTitle = preg_replace('/[^\w\d_ -]/si', '', $currentTitle); 
?> 

我覺得這是一個普遍的編碼做法我很想念，但是至今一直都很難過。任何幫助將不勝感激。謝謝！

Answer 1

很簡單：$menuParentDepartment[3]沒有定義。在嘗試索引索引之前，您需要確保索引（或者稱爲PHP調用它，偏移量）存在。使用isset。