Using array element values to access another array

[NotionCommotion]

Given ['someGroup', 'someSubgroup', 'someProperty'], how can I tell if $array['someGroup']['someSubgroup']['someProperty'] is set and if so return the value?

Use case:

The following method receives argument such as someProperty, someGroup.someProperty, someGroup.someSubgroup.someProperty, etc which are period delimited, and checks if the value is set and if so returns the value.  I am looking at a more generic approach which is not hard coded to three levels.  As I write this, I see I can use some loop, but still question whether there is a more elegant approach

 

public function get(string $property) {
    $arr=explode('.',$properties);
    switch(count($arr)) {
        case 1:
            if(isset($this->properties[$arr[0]])) {
                return $this->properties[$arr[0]];
            }
            else {
                throw new AccountException("Property '$property' does not exist.");
            }
            break;
        case 2:
            if(isset($this->properties[$arr[0]][$arr[1]])) {
                return $this->properties[$arr[0]][$arr[1]];
            }
            else {
                throw new AccountException("Property '$property' does not exist.");
            }
            break;
        case 3:
            if(isset($this->properties[$arr[0]][$arr[1]][$arr[2]])) {
                return $this->properties[$arr[0]][$arr[1]][$arr[2]];
            }
            else {
                throw new AccountException("Property '$property' does not exist.");
            }
            break;
        default:
            throw new AccountException("Invalid property '$property'. Only 3 levels are supported");
    }
}

 

[kicken]

Loop over the keys you want to check.

If the key exists in the array, set the array to it's value and check the next key.   Otherwise return null (or whatever).

function getValue($array, $keySpec){
    foreach (explode('.', $keySpec) as $key){
        if (!isset($array[$key])){
            return null;
        }

        $array = $array[$key];
    }

    return $array;
}

$array = [
    'userList' => [
        '1234' => [
            'name' => 'Kicken'
        ]
    ]
];

var_dump(getValue($array, 'userList.1234.name'));

https://3v4l.org/AdcKW

 

[NotionCommotion]

Thanks kicken, I ended up using the following, but will try your solution out as well.

 

    public function get(string $property) {
        $keys=explode('.',$property);
        $properties = $this->read(false);

        while($key = array_shift($keys)){
            if(isset($properties[$key])) {
                $properties = $properties[$key];
            }
            else {
                break;
            }
        }

        if(!is_array($properties)) {
            return $properties;
        }
        else {
            throw new AccountException("Property '$property' does not exist.");
        }
    }

 

[requinix]

Same difference.