PHP变量变量数组键列表

Question

I have a multidimensional array where this works:

print_r( $temp[1][0] );

How can I make this work... I have the list of keys as a string like this:

$keys = "[1][0]";

I want to access the array using the string list of keys, how can it be done? This works but the keys are obviously hard coded:

$keys = "[1][0]";
$tempName = 'temp';

print_r( ${$tempName}[1][0] );

// tried lots of variations like, but they all produce errors or don't access the array
print_r( ${$tempName.${$keys}} );

Thanks, Chris

Answer 1

function accessArray(array $array, $keys) {
    if (!preg_match_all('~\[([^\]]+)\]~', $keys, $matches, PREG_PATTERN_ORDER)) {
        throw new InvalidArgumentException;
    }

    $keys = $matches[1];
    $current = $array;
    foreach ($keys as $key) {
        $current = $current[$key];
    }

    return $current;
}

echo accessArray(
    array(
        1 => array(
            2 => 'foo'
        )
    ),
    '[1][2]'
); // echos 'foo'

Would be even nicer, if you passed in array(1, 2), instead of [1][2]: One could avoid the (fragile) preg_match_all parsing.