PHP - find value comparing two multi-dimensional arrays

Question

I've here two multi-dimensional arrays.

How would you do to get the image_to_get value in the $b array thanks to the $a array ?

$a = array(
    'thumbs' => array(
        '0' => array(
            'thumb1a' => array(
                '0' => array(
                    'thumb1' => ""
                )
            )
        )
    )
);

$b = array(
    'thumbs' => array(
        '0' => array(
            'thumb1a' => array(
                '0' => array(
                    'thumb1' => "image_to_get"
                )
            ),
            'thumb2' => 'image2',
            'thumb3' => 'image3',
            'thumb4' => 'image4',
            'thumb5' => 'image5',
        )
    )
);

Is it always at a known depth, or do you have handle any level of nesting? — Barmar
– Barmar, Commented Jan 23, 2014 at 8:22
stackoverflow.com/questions/19299137/… Can you check this question? It seems related to yours — FreshPro
– FreshPro, Commented Jan 23, 2014 at 8:33

hsz · Accepted Answer · 2014-01-23 08:54:02Z

You can try with:

function getAPath($array) {
    if (empty($array)) {
        return array();
    }
    $key = key($array);

    return array_merge(array($key), getAPath($array[$key]));
}
function getBValue($array, $path) {
    $key = array_shift($path);

    if (is_null($key) || empty($array)) {
        return $array;
    }

    return getBValue($array[$key], $path);
}

$aPath  = getAPath($a);
$bValue = getBValue($b, $aPath);
var_dump($bValue);

First function getAPath flatterns your $a array into:

array (size=5)
  0 => string 'thumbs' (length=6)
  1 => int 0
  2 => string 'thumb1a' (length=7)
  3 => int 0
  4 => string 'thumb1' (length=6)

Second function getBValue walks through the $b array using $aPath.

Below lovely one-liners ;-)

function getAPath($array) {
    return empty($array) ? array() : array_merge(array($key = key($array)), getAPath($array[$key]));
}
function getBValue($array, $path) {
    return (is_null($key = array_shift($path)) || empty($array)) ? $array :  getBValue($array[$key], $path);
}

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