如何在以下场景中使用foreach循环结构循环关联数组？

Question

I've an array titled $rebate_by_product:

Array
(
    [op] => preview
    [id] => 
    [form_submitted] => yes
    [company_id] => 46
    [1] => Array
        (
            [pack] => 10
            [quantity] => 20
            [volume] => 30
            [units] => 9
            [amount] => 40
            [rebate_start_date] => 2014-05-01
            [rebate_expiry_date] => 2014-05-05
            [applicable_states] => Array
                (
                    [0] => 1
                    [1] => 2
                    [2] => 3
                )

            [rebate_total_count] => 5000
            [products] => Array
                (
                    [1] => 9
                    [2] => 10
                )

        )

    [2] => Array
        (
            [pack] => 50
            [quantity] => 60
            [volume] => 70
            [units] => 10
            [amount] => 80
            [rebate_start_date] => 2014-05-06
            [rebate_expiry_date] => 2014-05-10
            [applicable_states] => Array
                (
                    [0] => 14
                    [1] => 15
                    [2] => 16
                )

            [rebate_total_count] => 10000
            [products] => Array
                (
                    [1] => 11
                    [2] => 8
                )

        )

    [3] => Array
        (
            [pack] => 100
            [quantity] => 200
            [volume] => 300
            [units] => 7
            [amount] => 400
            [rebate_start_date] => 2014-05-21
            [rebate_expiry_date] => 2014-05-30
            [applicable_states] => Array
                (
                    [0] => 26
                    [1] => 33
                    [2] => 42
                )

            [rebate_total_count] => 9999
            [products] => Array
                (
                    [1] => 9
                    [2] => 8
                )

        )

    [multiselect] => 42
)

You can observe from above array that it has few elements which are not array but it has three such elements which are themselves array and even few of its data elements are also arrays so how to loop over this kind of array using foreach loop?

Answer 1

If you just want to print each one the just use foreach loop. Consider this example:

$product_keys = array(); // edited
// loop them, if its an array, loop inside it again
foreach($rebate_by_product as $index => $element) {
    if(is_array($element)) {
        foreach($element as $key => $value) {
            if(is_array($value)) {

                // EDITED
                if($key == 'products') {
                    $product_keys = array_merge($product_keys, $value);
                }

                $value = implode(',', $value);
                echo "$key => $value <br/>";
            } else {
                echo "$key => $value <br/>";
            }
        }
    } else {
        echo "$index => $element <br/>";
    }
}

// if product items has duplicates check here (edited)
if(count($product_keys) != count(array_unique($product_keys))) {
    echo "<script>alert('This array has duplicate products');</script>";
} else {
    echo "<script>alert('Products are ok');</script>";
}

Or if you want, you cant just use iterators on this one:

$recursive = new RecursiveIteratorIterator(new RecursiveArrayIterator($rebate_by_product));
foreach($recursive as $key => $value) {
    echo "$key => $value <br/>";
}