PHP Arrays- 4個獨立的陣列，但只希望返回一個值

Question

看看這些陣列

Array( 
[CompInvId] => 17 [Item] => w [Qty] => w [Tax_Rate] => 10 [Price] => w [ss] => w 
) 
Array( 
[CompInvId] => 17 [Item] => 4 [Qty] => 4 [Tax_Rate] => 10 [Price] => 4 [ss] => 4 
) 
Array( 
[CompInvId] => 17 [Item] => 4 [Qty] => 4 [Tax_Rate] => 10 [Price] => 4 [ss] => 4 
) 
Array(
[CompInvId] => 17 [Item] => 4 [Qty] => 4 [Tax_Rate] => 20 [Price] => 4 [ss] => 4 
) 

如何獲取剛剛從所有這些價值17？

Answer 1

使用foreach通過陣列

foreach($arr as $key=>$val) // $arr is your array 
{ 
    $val['CompInvId']; 
} 

Answer 2

$a = array_column($array,'CompInvId'); 
print_r($a); 

這裏$陣列來迭代將是你的主陣列（在問題中提到）。