Question

我从数据库中取出一个对象，然后我转换了＃39;它是数组，以便我可以使用foreach。

$my_obj = (array) json_decode( get_option('my_options') );

当我对其进行print_r时，这会得到像这样的数组：

Array (
    [0] => stdClass Object (
        [settings] => stdClass Object (
        [default] => 1 
        [header_title] => Separate title for this one! 
        [header_layout] => header_logo_centered 
        [fixed_header] => 1 
        [sticky_header] => 0 
        [transparent_header_transition] => 1 
        [select_menu] => centered-logo-header 
        [select_second_menu] => left-menu-header 
        [logo] => 
        [retina_logo] => ...wp-content/uploads/2015/12/sample.jpg 
        [retina_logo_width] => 
        [retina_logo_height] => 
        [transparent_logo] => 
        [transparent_retina_logo] => 
        [transparent_retina_logo_width] => 
        [transparent_retina_logo_height] => 
        [background_image] => ...wp-content/uploads/2015/08/audiothumb1.jpg 
        [background_color] => #848484 
        [text_color] => #397509 
        [text_hover_color] => 
        [transparent_text_color] => 
        [transparent_text_hover_color] => #146051 
        [test_select] => test_option_3 
        [test_textarea] => This is a test for textarea....ghghfsd 
        [test_pages_dropdown] => 5452 
        [icon_number] => 1 
        [test_icons_icon_0] => s7-magic-wand 
        [test_icons_value_0] => test2
        )
    )
    [1] => stdClass Object (
        [settings] => stdClass Object (
        [default] => 0 
        [header_title] => Test title here... 
        [header_layout] => header_layout_logo_left_magic_background 
        [fixed_header] => 
        [sticky_header] => 
        [transparent_header_transition] => 
        [select_menu] => 
        [select_second_menu] => 
        [logo] => 
        [retina_logo] => 
        [retina_logo_width] => 
        [retina_logo_height] => 
        [transparent_logo] => 
        [transparent_retina_logo] => 
        [transparent_retina_logo_width] => 
        [transparent_retina_logo_height] => 
        [background_image] => 
        [background_color] => 
        [text_color] => 
        [text_hover_color] => 
        [transparent_text_color] => 
        [transparent_text_hover_color] => 
        [test_select] => 
        [test_textarea] => 
        [test_pages_dropdown] => 
        [icon_number] => 0
        )
    )
)

现在我试着这样做：

$my_obj[0]

我得到了

注意未定义的偏移量0 ......

我无法从中得到任何东西。但是当我对它做一个foreach时，我可以很好地访问我的对象及其所有属性。

为什么会这样？

Answer 1

json_decode将json转换为数组，因此需要显式定义数组。
对于获取stdclass对象，您可以在$object->key的情况下通过$my_obj[0]->settings提取数据，或者可以将对象从以下代码转换为数组
```
foreach ($object as $value) 
  $array[] = $value->post_id;
```

Answer 2

function objectToArray( $object ) {
    if( !is_object( $object ) && !is_array( $object ) ) {
        return $object;
    }
    if( is_object( $object ) ) {
        $object = get_object_vars( $object );
    }
    return array_map( 'objectToArray', $object );
}

尝试此功能（对于多维obj）...并在此处粘贴print_r

无法在php中访问显式定义的数组的值

2 个答案: