如何确定任何数组键的值是否是我要寻找的值？

Question

I have an array of arrays like this:

$cart = Array ( 
[0] => Array ( [TypeFlag] => S [qty] => 2 [denom] => 50  [totalPrice] =>  100 )
[1] => Array ( [TypeFlag] => V [qty] => 1 [denom] => 25  [totalPrice] => 25 ) 
[2] => Array ( [TypeFlag] => C [qty] => 1 [denom] => 25  [totalPrice] => 25 ) 
) 

Is there any way, short of looping through all of them and checking one at a time, to determine if the TypeFlag value for any of them is S?

Answer 1

Try this:

foreach($cart as $key => $value) {
    if ($value['TypeFlag'] == 'S') {
        return $key;
    }
}

This would return the key of the sub-array that has a TypeFlag value of S . However, this would stop after it finds the first sub-array that matches your search pattern. Not sure what your desired output is tho and how many results are expected. If you can provide more info, I can give you a more accurate example.

Answer 2

Given a function that returns the TypeFlag for each element of your array:

function get_type_flag($item) {
    return $item["TypeFlag"];
}

You could apply that function to each element in the array:

$typeflags = array_map("get_type_flag", $cart);

and see if S is in that array:

if (in_array("S", $typeflags)) {
    ...
}