php - 通过将现有数组中的键剪切到新数组来创建新数组

Question

我想获取一个数组并从中剪切一些键(不按顺序)并从中创建一个新数组。

我已使用 array_shift() 函数完成此操作，但到了需要跳过下一个键然后再次执行 array_shift 的地步。

我如何从逻辑上解决这个问题？

我的数组

Array
(
    [api] => Array
        (
            [0] => system
            [1] => assets
            [2] => theme
            [3] => resources
            [4] => api
            [5] => xml
            [6] => json
            [7] => jsonp
            [8] => request
        )

    [class] => Array
        (
            [name] => authentication
            [abbr] => auth
        )

    [directories] => Array
        (
            [application] => application
            [mvc] => Array
                (
                    [model] => model
                    [view] => view
                    [controller] => controller
                )

            [assets] => Array
                (
                    [folder] => assets
                    [css] => css
                    [img] => img
                    [js] => js
                )

            [config] => config
        )

    [smarty] => Array
        (
            [security] => on
            [delimiter] => Array
                (
                    [left] => {!
                    [right] => !}
                )

            [template] => Array
                (
                    [header] => header
                    [footer] => footer
                    [extension] => tpl
                )

        )

    [version] => Array
        (
            [component] => Array
                (
                    [0] => Array
                        (
                            [name] => CMS
                            [version] => 1.0
                        )

                    [1] => Array
                        (
                            [name] => TinyMCE jQuery Package
                            [version] => 3.5
                        )

                    [2] => Array
                        (
                            [name] => jQuery
                            [version] => 1.7.2
                        )

                )

            )
)

我需要用它们的键创建一个新数组:api、class、version

Answer 1

创建一个明确的键列表，您希望将这些键从一个数组移动到另一个数组。循环查看该列表，从一个列表中拉出并添加到另一个列表中。然后从原始数组中删除旧副本:

// Original Array, and empty Array
$array = array( 'api' => 1, 'class' => 2, 'fizz' => 3, 'buzz' => 4 );
$newAr = array();

// For each key we'd like to keep
foreach ( array( 'api', 'class' ) as $key ) {
  // (Re)move the value from the original array to our new array
  $newAr[$key] = $array[$key]; unset( $array[$key] );
}

// Show the contents of the new array
print_r( $newAr );

立即在线试用:http://codepad.org/7iYG4iVB