Question

I am checking that certain elements in sub-arrays in a multidimensional array are not equal to a value and un-setting the array with that value from the multi array. I built a function so that I could easily implement this, however it doesn’t appear to be working.

function multi_unset($array, $unset) {
    foreach($array as $key=>$value) {
        $arrayU = $array[$key];
        $check = array();
        for($i = 0; $i < count($unset); $i++) { // produces $array[$key][0, 2, 3]
            array_push($check, $arrayU[$unset[$i]]);
        }
        if(in_array("-", $check)) {
            unset($array[$key]);
        }
    }
    return $array;
}
$arr = array(array("-", "test", "test", "test"), array("test", "test", "test", "test"));
$unset = array(0, 2, 3); // keys in individual arrays to check
multi_unset($arr, $unset);
print_r($arr); // Should output without $arr[0]

In this case, I’m checking if each sub-array has a “-” value in it and un-setting the array from the multi array. I am only checking specific keys in the sub-arrays (0, 2, 3) however it outputs an array without any changes. I figured I must have some scoping wrong and tried to use “global” everywhere possible, but that didn’t seem to fix it.

Answer 1

Modified your version a bit and handled the return value.

function multi_unset($array, $unset)
{
    $retVal = array();
    foreach($array as $key => $value)
    {
        $remove = false;
        foreach($unset as $checkKey)
        {
            if ($value[$checkKey] == "-")
                $remove = true;
        }
        if (!$remove)
            $retVal[] = $value;
    }
    return $retVal;
}

$arr = array(array("-", "test", "test", "test"), array("test", "test", "test", "test"));
$unset = array(0, 2, 3);
$arr = multi_unset($arr, $unset);
print_r($arr);