public static function countMinDepth($potentialArray, $depth = 0)
    {
        // validation, must be positive int or 0
        if (!self::isLogicallyCastableToInt($depth)) {
            throw new InvalidArgumentException('Depth parameter must be non-negative integer');
        }
        if ($depth < 0) {
            throw new InvalidArgumentException('Depth parameter must be non-negative integer');
        }

        $return = $depth;
        if (is_array($potentialArray)) {
            $return++;
            $childrenDepths = array();
            foreach ($potentialArray as $element) {
                $childrenDepths[] = self::countMinDepth($element, $return);
            }
            $return = empty($childrenDepths) ? $return : min($childrenDepths);
        }

        return $return;
    }
public static function countMinDepth($potentialArray, $depth = 0)
    {
        // validation, must be positive int or 0
        if (!self::isLogicallyCastableToInt($depth)) {
            throw new InvalidArgumentException('Depth parameter must be non-negative integer');
        }
        if ($depth < 0) {
            throw new InvalidArgumentException('Depth parameter must be non-negative integer');
        }

        $return = $depth;
        if (is_array($potentialArray)) {
            $return++;
            $childrenDepths = array();
            foreach ($potentialArray as $element) {
                $childrenDepths[] = self::countMinDepth($element, $return);
            }
            $return = empty($childrenDepths) ? $return : min($childrenDepths);
        }

        return $return;
    }
public static function countMinDepth ( $ potentialArray , $ depth = 0 ) { // validation, must be positive int or 0 if ( ! self :: isLogicallyCastableToInt ( $ depth ) ) { throw new InvalidArgumentException ( 'Depth parameter must be non-negative integer' ) ; } if ( $ depth < 0 ) { throw new InvalidArgumentException ( 'Depth parameter must be non-negative integer' ) ; } $ return = $ depth ; if ( is_array ( $ potentialArray ) ) { $ return ++ ; $ childrenDepths = array ( ) ; foreach ( $ potentialArray as $ element ) { $ childrenDepths [ ] = self :: countMinDepth ( $ element , $ return ) ; } $ return = empty ( $ childrenDepths ) ? $ return : min ( $ childrenDepths ) ; } return $ return ; }
Counts maximum array depth

@param mixed $potentialArray
@param int   $depth

@return int
@throws InvalidArgumentException
Counts maximum array depth