将多维数组拆分为两个新数组

Question

I have this multidimensional array:

Array
(
    [userId] => 35
    [fieldId] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [4] => 4
        )

    [educationTitle] => Array
        (
            [0] => School1
            [1] => School2
            [2] => 3
            [4] => 
        )

    [educationDegree] => Array
        (
            [0] => Degree1
            [1] => Degree2
            [2] => 3
            [4] => 
        )

    [startDate] => Array
        (
            [0] => 2013-03-01
            [1] => 2013-03-03
            [2] => 1970-01-01
        )

    [endDate] => Array
        (
            [0] => 2013-03-02
            [1] => 2013-03-04
            [2] => 1970-01-01
        )

    [educationDescription] => Array
        (
            [0] => Description1
            [1] => Description2
            [2] => 
        )

)

And I have an array of ids called matches:

    [matches] => Array
        (
            [0] => 1
            [1] => 2

        )

I need to split the main array into two:

$eduAdd = array()
$eduUpdate = array()

$eduAdd will contain the non-matching fieldId's and $eduUpdate will contain the matching fieldId's.

$eduAdd Would look like this:

Array
    (
        [userId] => 35
        [fieldId] => Array
            (
                [2] => 3
                [4] => 4
            )

        [educationTitle] => Array
            (
                [2] => 3
                [4] => 
            )

        [educationDegree] => Array
            (

                [2] => 3
                [4] => 
            )

        [startDate] => Array
            (

                [2] => 1970-01-01
            )

        [endDate] => Array
            (

                [2] => 1970-01-01
            )

        [educationDescription] => Array
            (

                [2] => 
            )

    )

I tried this, but found out in_array does not work on multidimensional arrays:

foreach($filteredSubmittedData as $filteredUpdates){
    if(in_array($filteredUpdates['fieldId'], $matches)){
        echo "yup";
    }
}

How can I do this?

Answer 1

Solution

Considering $main to be your main array and $matches to be your matches array:

$eduAdd = array();
$eduUpdate = array();
$itodel = array();
foreach ($main['fieldId'] as $i => $v)
    if (isset($matches[$i]) and $matches[$i] == $v)
        $itodel[] = $i;

foreach ($main as $key => $arr) {
    if (!is_array($arr)) continue;
    foreach ($arr as $i => $v) {
        if (in_array($i, $itodel))
            $eduUpdate[$key][$i] = $v;
        else
            $eduAdd[$key][$i] = $v;
    }
}   

Explanation

First of all we need to populate an array of indexes that are matched inside $main['fieldId']. Those are the indexes that will be moved to $eduUpdate and that will not be inserted into $eduAdd:

$itodel = array();
foreach ($main['fieldId'] as $i => $v)
    if (isset($matches[$i]) and $matches[$i] == $v)
        $itodel[] = $i;

Then we run another foreach loop that will actually split the $main array into the other two. The main condition is if (in_array($i, $itodel)) because if we are watching an index that is inside the ones that should go into $eduUpdate then we should add it to it, otherwise we just insert it into $eduAdd.