ACF custom field in <head>

我通过ACF插件使用图像URL创建了一个图像字段。此字段显示在我的页面中。此字段允许管理员更改选定类的背景图像。

这是我在<head></head> 标签：

<?php
    while ( have_posts() ) : the_post();
        $background = get_field(\'background\'); ?>
        <style>
            .site-header {
            background: url(<?php echo $background; ?>) no-repeat center;
            background-size: cover;
            }
        </style>
    <?php endwhile; // end of the loop.  
 ?>

通过源，url显示为空。我做错了什么？我知道ACF不能在循环之外工作，这就是为什么我在<head>.

以下是ACF导出：

if( function_exists(\'acf_add_local_field_group\') ):

acf_add_local_field_group(array (
    \'key\' => \'group_560e6c0620487\',
    \'title\' => \'Header Background\',
    \'fields\' => array (
        array (
            \'key\' => \'field_560e6c0ed9ca8\',
            \'label\' => \'Background Image\',
            \'name\' => \'background\',
            \'type\' => \'image\',
            \'instructions\' => \'\',
            \'required\' => 0,
            \'conditional_logic\' => 0,
            \'wrapper\' => array (
                \'width\' => \'\',
                \'class\' => \'\',
                \'id\' => \'\',
            ),
            \'return_format\' => \'url\',
            \'preview_size\' => \'thumbnail\',
            \'library\' => \'all\',
            \'min_width\' => \'\',
            \'min_height\' => \'\',
            \'min_size\' => \'\',
            \'max_width\' => \'\',
            \'max_height\' => \'\',
            \'max_size\' => \'\',
            \'mime_types\' => \'\',
        ),
    ),
    \'location\' => array (
        array (
            array (
                \'param\' => \'page_type\',
                \'operator\' => \'==\',
                \'value\' => \'top_level\',
            ),
        ),
    ),
    \'menu_order\' => 0,
    \'position\' => \'normal\',
    \'style\' => \'default\',
    \'label_placement\' => \'top\',
    \'instruction_placement\' => \'label\',
    \'hide_on_screen\' => \'\',
    \'active\' => 1,
    \'description\' => \'\',
));

endif;

<?php global $wp_query; $post = $wp_query->post; $background = get_field(\'background\', $post->ID); ?> <style> .site-header { background: url(<?php echo $background; ?>) no-repeat center; background-size: cover; } </style>

<?php // using $post from the global scope (not within loop) - your setup may vary $background = get_field(\'background\', $post->ID); ?> <style> .site-header { background: url(<?php echo $background; ?>) no-repeat center; background-size: cover; } </style>

Increase offset while looping

我正在编写一个自定义帖子插件，它将自定义帖子分组显示为选项卡。每组4个岗位。是否可以编写一个偏移量随每次循环而增加的查询？因此，结果将是：-第一个查询显示从1到4的帖子-第二个查询显示从5到8的帖子-第三个查询显示从9到12的帖子等。 <div class=\"official-matters-tabs\"> <?php $args = array(\'post_type\' => \'official-matters\', \'showp

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Increase offset while looping