检查PHP数组键是否有二维数组

Question

Can i use array_key_exists to check for a given key into a bidimensional array ? or there is a better way to check for ['payment']['id'] key ?

I try : array_key_exists('payment.id',$data) and array_key_exists('product.id',$data)

But can not see it working as expected.

Eg. array_key_exists(payment.id,$data), where i have an array :
array(
[payment] array( [id]=>123 [date]=>2016-01-20 ) 
[product] array( [id]=>456 [qtty]=>3 )
)

Answer 1

Try this. Give this a read.

if (array_key_exists('id', $data['payment'])) {
    echo "The 'id' element is in the payment array.";
}
if (array_key_exists('id', $data['product'])) {
    echo "The 'id' element is in the product array.";
}