如果Key Value对存在于多维数组中。如何？

I have a codeigniter shopping cart going and its "cart" array is the following:

Array (
[a87ff679a2f3e71d9181a67b7542122c] => Array
    (
        [rowid] => a87ff679a2f3e71d9181a67b7542122c
        [id] => 4
        [qty] => 1
        [price] => 12.95
        [name] => Maroon Choir Stole
        [image] => 2353463627maroon_3.jpg
        [custprod] => 0
        [subtotal] => 12.95
    )

[8f14e45fceea167a5a36dedd4bea2543] => Array
    (
        [rowid] => 8f14e45fceea167a5a36dedd4bea2543
        [id] => 7
        [qty] => 1
        [price] => 12.95
        [name] => Shiny Red Choir Stole
        [image] => 2899638984red_vstole_1.jpg
        [custprod] => 0
        [subtotal] => 12.95
    )

[eccbc87e4b5ce2fe28308fd9f2a7baf3] => Array
    (
        [rowid] => eccbc87e4b5ce2fe28308fd9f2a7baf3
        [id] => 3
        [qty] => 1
        [price] => 14.95
        [name] => Royal Blue Choir Stole
        [image] => 1270984005royal_vstole.jpg
        [custprod] => 1
        [subtotal] => 14.95
    )

)

My goal is to loop through this multidimensional array some how and if ANY product with the key value pair "custprod == 1" exists, then my checkout page will display one thing, and if no custom products are in the cart it displays another thing. Any help is appreciated. Thanks.

Rather than looping over it, you can check for the custprod key using array_key_exists. Or simply check to see if arr['custprod'] isset (both functions handle null differently).

$key = "custprod";
$arr = Array(
    "custprod" => 1, 
    "someprop" => 23
);
if (array_key_exists($key, $arr) && 1 == $arr[$key]) {
    // 'custprod' exists and is 1
}

You still need to loop the array to check it:

$cust_prod_found = false;

foreach($this->cart->contents() as $item){
    if (array_key_exists("custprod", $item) && 1 == $item["custprod"]) {
        $cust_prod_found = true; break;
    }
}

if ($cust_prod_found) {
    // display one thing
} else {
    // display another thing
}

function item_exists($cart, $custprod) {
    foreach($cart as $item) {
        if(array_key_exists("custprod", $item) && $item["custprod"] == $custprod) {
            return true;
        }
    }
    return false;
}

Now, you can use this function to check if product exist in stack:

if(item_exists($cart, 1)) {
    // true
} else {
   // false
}