从多维数组中取消设置变量特定键

Question

I have different multidimensional arrays with different keys and values:

$array_1 = array('cars' => array('audi' => array('a3' => array('one', 'two', 'three'), 'a5' => array('five', 'six', 'seven')), 'mercedes' => array('type_1' => array('submodel' => array('whatever'))), 'other_cat' => array('different_things')));

then I would like to unset a specific key, for example:

unset($array_1['cars']['audi']['a5']);

Now I like to "split it up", to have the key variable.

$to_unset = ['cars']['audi']['a5']; 

How can I unset that specific (variable!) key?

Aäron

Answer 1

An easy utility to avoid removing array keys that do not exist by accident:

function removeArrayKey($path, &$array ) {

    $array_temp = &$array;
    $previousItem = null;

    $path_bits = explode( ".", $path );

        foreach( $path_bits as &$path_bit ) {

           if( !isset( $array_temp[ $path_bit ] ) ) {
                  die("Error" . $path_bit);
                   //throw new Exception( "Path does not exist in array" );
            }

            $previousItem = &$array_temp;
            $array_temp = &$array_temp[ $path_bit ];

        }

        if( isset( $previousItem ) ) {

             unset( $previousItem[ $path_bit ] );

        }

        return $array;

}

To use the function, simply use removeArrayKey( "cars.mercedes.cars", $array_1 ); and separate each array index with a .