獲取多維數組中所有具有相同索引的數組元素

Question

請注意一個基本問題。有人可以幫助我獲得所有三個maincategory字符串（事情做，交通和生活）。我只發現如何讓他們個人

$categories[0]->maincategory; 

但我怎麼能得到他們所有三個？非常感謝！

Array 
(
[0] => stdClass Object 
    (
     [id] => 2 
     [maincategory] => Things to Do 
     [category] => Activities and Attractions 
    ) 

[1] => stdClass Object 
    (
     [id] => 6 
     [maincategory] => Transportation 
     [category] => Airport Transfers 
    ) 

[2] => stdClass Object 
    (
     [id] => 11 
     [maincategory] => Living 
     [category] => Broadband Internet 
    ) 
) 

Answer 1

像

foreach ($stdClass as $sclass){ 
    if(!is_array($sclass)){ 
    echo $sclass.' '; 
    }else{ 
    foreach ($sclass as $scl){ 


    echo $scl.' '; 
    } 
    } 

    } 

Answer 2

簡單foreach循環會做的伎倆。

foreach ($categories as $category) { 
    echo $category->maincategory; 
}