现有答案很好，但如果要添加新的自定义帖子类型，则必须反复重新编辑这些函数。

为了解决这个问题，我开发了这个小函数。只需定义$new_positions 内部my_new_menu_order 功能：

/**
 * Activates the \'menu_order\' filter and then hooks into \'menu_order\'
 */
add_filter(\'custom_menu_order\', function() { return true; });
add_filter(\'menu_order\', \'my_new_admin_menu_order\');
/**
 * Filters WordPress\' default menu order
 */
function my_new_admin_menu_order( $menu_order ) {
  // define your new desired menu positions here
  // for example, move \'upload.php\' to position #9 and built-in pages to position #1
  $new_positions = array(
    \'upload.php\' => 9,
    \'edit.php?post_type=page\' => 1
  );
  // helper function to move an element inside an array
  function move_element(&$array, $a, $b) {
    $out = array_splice($array, $a, 1);
    array_splice($array, $b, 0, $out);
  }
  // traverse through the new positions and move 
  // the items if found in the original menu_positions
  foreach( $new_positions as $value => $new_index ) {
    if( $current_index = array_search( $value, $menu_order ) ) {
      move_element($menu_order, $current_index, $new_index);
    }
  }
  return $menu_order;
};

使用register\\u post\\u type（）创建帖子类型时，可以设置菜单位置：

menu\\u position（integer）（可选）post类型在菜单顺序中的位置。show\\u in\\u menu必须为true。

    Default: null - defaults to below Comments 

    5 - below Posts
    10 - below Media
    15 - below Links
    20 - below Pages
    25 - below comments
    60 - below first separator
    65 - below Plugins
    70 - below Users
    75 - below Tools
    80 - below Settings
    100 - below second separator

您可以在自己的插件中设置级别。如果您试图更改尚未创建的插件的菜单位置，许多插件可能具有可插入性，或者您可以编辑其调用。

感谢rassoh提供了一个不错的选择。

这是一个修订版，其中包含一个页面列表，可能应该始终保持在顶部。。。

/**
 * These 2 filters and 1 function move the built in WordPress admin pages to
 * the top so they don\'t get pushed down the menu every time a new plugin is installed.
 * Activates the \'menu_order\' filter and then hooks into \'menu_order\'
 */
add_filter(\'custom_menu_order\', function() { return true; });
add_filter(\'menu_order\', \'my_new_admin_menu_order\');
/**
 * Filters WordPress\' default menu order
 */
function my_new_admin_menu_order( $menu_order ) {
  // define your new desired menu positions here
  // for example, move \'upload.php\' to position #9 and built-in pages to position #1
  $new_positions = array(
    \'index.php\' => 1,  // Dashboard
    \'edit.php\' => 2,  // Posts
    \'upload.php\' => 3,  // Media
    \'edit.php?post_type=page\' => 4,  // Pages
    \'edit-comments.php\' => 5  // Comments
  );
  // helper function to move an element inside an array
  function move_element(&$array, $a, $b) {
    $out = array_splice($array, $a, 1);
    array_splice($array, $b, 0, $out);
  }
  // traverse through the new positions and move 
  // the items if found in the original menu_positions
  foreach( $new_positions as $value => $new_index ) {
    if( $current_index = array_search( $value, $menu_order ) ) {
      move_element($menu_order, $current_index, $new_index);
    }
  }
  return $menu_order;
};