PHP搜索多维数组以获取重复值

Question

I have an array like this:

[0] => Array
    (
        [0] => Array
            (
                [Foo] => Bar
                [Foo2] => String1
            )

    )

[1] => Array
    (
        [0] => Array
            (
                [Foo] => Bar
                [Foo2] => String2
            )

    )

While the one I'm working with is a lot larger, that's the general form of it. I'm trying to look at each value relative to Foo, and if there is a repeat in one of the arrays, take the subsequent Foo2 value and "push" it to a new array, essentially looking like this:

[0] => Array
    (
    [0] => Array
        (
            [Foo] => Bar
                [Foo2] => String1,
                           String2 
        )

)

Basically I just want to know if this is even possible!!

Answer 1

The solution using isset and array_values functions:

$grouped = [];
foreach ($arr as $v) {  // $arr is your initial array
    $foo = $v[0]['Foo'];
    if (!isset($grouped[$foo])) {
        $grouped[$foo] = $v[0];
    } else {
        $grouped[$foo]['Foo2'] .= "," . $v[0]['Foo2'];
    }
}
$result = array_values($grouped);
print_r($result);

DEMO link