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php - 将 preg_replace 转换为 preg_replace_callback

问题描述

这是我的字符串

 $wpheader_output = "<!-- This site is optimized with the Yoast SEO plugin v11.0 - https://yoast.com/wordpress/plugins/seo/ -->
<meta name='msvalidate.01' content='C0C36649CDED53868CDF54EE8754432A' />
<meta name='google-site-verification' content='JhzC8-kGVNcajTnSfsFDtEbpnDt0FcTe6Y3I5z79Lig' />


<link rel='dns-prefetch' href='//s.w.org' />
<style id='yasrcss-inline-css' type='text/css'>

    .star-rating {
            background-image: url('https://www.example.com/wp-content/plugins/yet-another-stars-rating/img/star_oxy_0.svg');
        }
        .star-rating .star-value {
            background: url('https://www.example.com/wp-content/plugins/yet-another-stars-rating/img/star_oxy_1.svg') ;
        }

.star-rating .star-value {
                        -moz-transform: scaleX(-1);
                        -o-transform: scaleX(-1);

                        -webkit-transform: scaleX(-1);
                        transform: scaleX(-1);
                        filter: FlipH;
                        -ms-filter: 'FlipH';
                        right: 0;
                        left: auto;
                    }
</style>
<link rel='stylesheet' id='style-css'  href='https://www.example.com/wp-content/themes/newseo/style.css' type='text/css' media='all' />
<link rel='https://api.w.org/' href='https://www.example.com/wp-json/' />
<script type='text/javascript'>
  window._wp_rp_static_base_url = 'https://wprp.zemanta.com/static/';
  window._wp_rp_wp_ajax_url = 'https://www.example.com/wp-admin/admin-ajax.php';
  window._wp_rp_plugin_version = '3.6.4';
  window._wp_rp_post_id = '12000';
  window._wp_rp_num_rel_posts = '7';
  window._wp_rp_thumbnails = false;
  window._wp_rp_post_tags = [];
  window._wp_rp_promoted_content = true;
  window._wp_rp_admin_ajax_url = 'https://www.example.com/wp-admin/admin-ajax.php';
  window._wp_rp_plugin_static_base_url = 'https://www.example.com/wp-content/plugins/wordpress-23-related-posts-plugin/static/';
</script>
<script type='text/javascript' src='https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js'></script> " ;

我需要删除这一行

<!-- This site is optimized with the Yoast SEO plugin v11.0 - https://yoast.com/wordpress/plugins/seo/ -->

我曾经用perg_replace它

$wpheader_output = preg_replace("/(<!-- This site is optimized with the Yoast SEO) (.|\n)*(plugins\/seo\/ -->)/", " ", $wpheader_output);

但是在升级 php 版本之后，这将不再起作用，所以我尝试了preg_replace_callback

这是我的代码

 $wpheader_output = preg_replace_callback("/(<!-- This site is optimized with the Yoast SEO) (.|\n)*(plugins\/seo\/ -->)/" , function($matches) {
    return " ";
}, $wpheader_output);

但它会在这个字符串上返回 null

标签： phpregex

解决方案

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