如何用ACF编写PHP数组来呈现职位发布的JSON-LD标记

我想在我的wordpress页面中为职业帖子添加一个动态JSON-LD（schema.org）。我在下面尝试了此代码。但我认为数组中有一些语法错误。可能是；“回声”；数组中不允许？我希望有人能帮我这个忙？

<?php function schema() {?>

<?php if( have_rows(\'schema_auszeichnung\') ): ?>
    <?php while( have_rows(\'schema_auszeichnung\') ): the_row(); 

        // Get sub field values.
        $title = get_sub_field(\'title\');
        $description = get_sub_field(\'description\');
        $state = get_sub_field(\'state\');
        $date = get_sub_field(\'date\');
        $street = get_sub_field(\'street\');
        $city = get_sub_field(\'city\');
        $postalcode = get_sub_field(\'postalcode\');


$schema = array(
    \'@context\'  => \'http://schema.org\',
    \'@type\'     => \'JobPosting\',
    \'title\'      => $title,
    \'description\' => $description,
    \'hiringOrganization\'   => array(
        \'@type\'           => \'Organization\',
        \'name\'            => \'cent GmbH\',
        \'sameAs\'          => get_home_url(),
        \'logo\'            => \'/wp/wp-content/uploads/2016/11/cropped-logo.png\'

    ),

    \'employmentType\'=> $state,
    \'datePosted\'    => $date,
    \'validThrough\'  => "",
    \'jobLocation\'   => array(

        \'@type\'     =>  "Place",
        \'address\'   => array (

            \'@type\' => \'PostalAddress\',
            \'streetAddress\' => $street,
            \'adressLocality\' => $city,
            \'postalCode\' => $postalcode,
            \'addressCountry\' => \'DE\'


        ),
    ),     


);

?>

<?php endwhile; ?>
<?php endif; ?>

<?php


echo \'<script type="application/ld+json">\' . json_encode($schema) . \'</script>\';
}

add_action(\'wp_head\', \'schema\');

?>

编辑：

删除“echo”后，我得到了php警告：未定义变量：schema。但对我来说，它是在这行中定义的：$schema=array。。。。。

<?php $faq_page_schema = \'\'; if( have_rows(\'questions\') ): while ( have_rows(\'questions\') ) : the_row(); $question = \'"\'.get_sub_field(\'question\').\'"\'; $answer = \'"\'.get_sub_field(\'answer\').\'"\'; $faq_page_schema .= "{ \\"@type\\": \\"Question\\", \\"name\\": $question, \\"acceptedAnswer\\": { \\"@type\\": \\"Answer\\", \\"text\\": $answer } }, "; endwhile; else : // no rows found endif; $faq_page_schema = substr_replace($faq_page_schema ,"", -2); echo \'<script type="application/ld+json"> { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [\'.$faq_page_schema.\'] } </script>\'; ?>

/博客/wp-json/nginx Return 404

我的主要领域是示例。com公司我已经在主域中实现了MEAN项目，现在我想要示例。wordpress安装程序的com/blog。我在nginx配置文件中完成了以下配置server { listen 80 default_server; listen [::]:80 default_server; server_name example.com; return 301 https://$host$request_uri;

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/博客/wp-json/nginx Return 404