PHP錯誤隱藏/解決錯誤未定義偏移

Question

我想隱藏未定義的錯誤偏移，當然，如果能夠最好地解決。

我現在有什麼

第2頁

的代碼顯示了我想要的。影像（每頁3個圖像）。 點擊頁面1示出了具有數001,002,003 頁2的圖像顯示出與004005006號等的圖像....

我的代碼

$catCode = isset($_GET["cat"]) ? $_GET["cat"] : "ac"; //getting url 
     $upperCatCode = strtoupper($catCode); 
     $arr = []; 

     //to get my images based on their image number 
     foreach ($productArr[$catCode] as $imgNumber => $productDetail) { 
      array_push($arr, $imgNumber); 
      $imgNumber = $arr; 
     } 

     echo"<div align='center'> 
     <ul class='pagination'>"; 

     // getting the total pages I need for the category if i want to display 3 images per page 
     for ($i = 1; $i < count($productArr[$catCode])/3 + 1; $i++) { 
      echo"<li><a href='http://localhost/ca1/collectionPage.php?cat={$catCode}&page={$i}'> {$i}</a></li> 
     "; 
     } 
     echo"<li><a href='http://localhost/ca1/collectionSummary.php?cat={$catCode}'>view all</a></li>"; 
     echo"</ul> 
     </div>"; 

// the loop i used to loop through the images 
for ($i = 0; $i < count($productArr[$catCode]); $i++) { 
     // count the total number of images 
     $total = count($arr); 
     // limit the number of images shown 
     $limit = 3; 
     //calculate the total number of pages 
     $totalPages = ceil($total/$limit); 
     $page = max($page, 1); //get 1 page when $_GET['page'] <= 0 
     $page = min($page, $totalPages); //get last page when $_GET['page'] > $totalPages 
     $offset = ($page - 1) * $limit; 
     if($offset < 0) {$offset = 0;} 
     $newArr = array_slice($arr, $offset, $limit); 

      echo "<div class='col-md-4'> 
       <div class='thumbnail'> 
        <a href='http://localhost/ca1/collectionDetail.php?cat={$catCode}&itemCode={$newArr[$i]}'><img class='img-responsive image_size' src='images/$catCode/row_{$catCode}{$newArr[$i]}_m0.jpg'></a> 
        <div class='caption'> 
         <p align='center'><b>Model No.Row-{$upperCatCode}-{$newArr[$i]}</b></p> 
        </div> 
       </div> 
      </div> "; 

Answer 1

添加isset檢查元件在陣列存在或不存在

if(isset($newArr[$i]) && $newArr[$i]){ 
echo "<div class='col-md-4'> 
      <div class='thumbnail'> 
       <a href='http://localhost/ca1/collectionDetail.php?cat={$catCode}&itemCode={$newArr[$i]}'><img class='img-responsive image_size' src='images/$catCode/row_{$catCode}{$newArr[$i]}_m0.jpg'></a> 
       <div class='caption'> 
        <p align='center'><b>Model No.Row-{$upperCatCode}-{$newArr[$i]}</b></p> 
       </div> 
      </div> 
     </div> "; 
    }