php - ドット表記で多次元配列にアクセスする

Question

ドット表記で多次元配列にアクセスできるクラスを作成しようとしています。

$config->get('bar.baz.foo');

それ以外の：

$config['bar']['baz']['foo']

これはクラスです：

<?php

class DotNotation
{
    /**
     * @var array
     */
    protected $values = array();

    public function __construct(array $values)
    {
        $this->values = $values;
    }

    /**
     * @param string $path
     * @param string $default
     * @return mixed
     */
    public function get($path, $default = null)
    {
        $array = $this->values;

        if (!empty($path)) {
            $keys = explode('.', $path);
            foreach ($keys as $key) {
                if (isset($array[$key])) {
                    $array = $array[$key];
                } else {
                    return $default;
                }
            }
        }

        return $array;
    }

    /**
     * @param string $path
     * @param mixed $value
     */
    public function set($path, $value)
    {
        $link = & $this->values;

        if (!empty($path)) {
            $keys = explode('.', $path);
            foreach ($keys as $key) {

                if (!isset($link[$key])) {
                    $link[$key] = array();
                }

                if (!is_array($link[$key])) {
                    throw new \RuntimeException("Can not set value for `$key` in `$path` path because it is not array.");
                }

                $link = & $link[$key];
            }
        }

        $link = $value;
    }

    /**
     * @param $path
     * @param array $values
     */
    public function add($path, array $values)
    {
        $get = (array)$this->get($path);
        $this->set($path, $this->arrayMergeRecursiveDistinct($get, $values));
    }

    /**
     * @param mixed $parameters
     */
    public function merge($parameters)
    {
        $this->add(null, (array)$parameters);
    }

    /**
     * @param string $path
     * @return bool
     */
    public function have($path)
    {
        $keys = explode('.', $path);
        $array = $this->values;
        foreach ($keys as $key) {
            if (isset($array[$key])) {
                $array = $array[$key];
            } else {
                return false;
            }
        }

        return true;
    }

    /**
     * array_merge_recursive does indeed merge arrays, but it converts values with duplicate
     * keys to arrays rather than overwriting the value in the first array with the duplicate
     * value in the second array, as array_merge does. I.e., with array_merge_recursive,
     * this happens (documented behavior):
     *
     * array_merge_recursive(array('key' => 'org value'), array('key' => 'new value'));
     *     => array('key' => array('org value', 'new value'));
     *
     * arrayMergeRecursiveDistinct does not change the datatypes of the values in the arrays.
     * Matching keys' values in the second array overwrite those in the first array, as is the
     * case with array_merge, i.e.:
     *
     * arrayMergeRecursiveDistinct(array('key' => 'org value'), array('key' => 'new value'));
     *     => array('key' => array('new value'));
     *
     * Parameters are passed by reference, though only for performance reasons. They're not
     * altered by this function.
     *
     * If key is integer, it will be merged like array_merge do:
     * arrayMergeRecursiveDistinct(array(0 => 'org value'), array(0 => 'new value'));
     *     => array(0 => 'org value', 1 => 'new value');
     *
     * @param array $array1
     * @param array $array2
     * @return array
     * @author Daniel <daniel (at) danielsmedegaardbuus (dot) dk>
     * @author Gabriel Sobrinho <gabriel (dot) sobrinho (at) gmail (dot) com>
     * @author Anton Medvedev <anton (at) elfet (dot) ru>
     */
    protected function arrayMergeRecursiveDistinct(array &$array1, array &$array2)
    {
        $merged = $array1;

        foreach ($array2 as $key => &$value) {
            if (is_array($value) && isset ($merged[$key]) && is_array($merged[$key])) {
                if (is_int($key)) {
                    $merged[] = $this->arrayMergeRecursiveDistinct($merged[$key], $value);
                } else {
                    $merged[$key] = $this->arrayMergeRecursiveDistinct($merged[$key], $value);
                }
            } else {
                if (is_int($key)) {
                    $merged[] = $value;
                } else {
                    $merged[$key] = $value;
                }
            }
        }

        return $merged;
    }
}

このクラスを使用しないように改善するにはどうすればよいexplodeですか?

Answer 1

strtok()の代わりに使用して書くことができますexplode()：

$a = array('foo' => array('bar' => array('baz' => 1)));

function resolve(array $a, $path, $default = null)
{
  $current = $a;
  $p = strtok($path, '.');

  while ($p !== false) {
    if (!isset($current[$p])) {
      return $default;
    }
    $current = $current[$p];
    $p = strtok('.');
  }

  return $current;
}

var_dump(resolve($a, 'foo.bar'));

// array('baz' => 1)