用最新的永久链接替换附件锚的hrefs。

原型

_fix_attachment_links( int|object $post )

参数

$post (int|object) (Required) 帖子ID或帖子对象。

返回值

(void|int|WP_Error)  如果没有固定,则无效。 0或

源文件

路径:wp-admin/includes/post.php

<?php
...
function _fix_attachment_links( $post ) {
	$post = get_post( $post, ARRAY_A );
	$content = $post['post_content'];
	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) )
		return;
	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( !strpos($content, '?attachment_id=') || !preg_match_all( '/<a ([^>]+)>[sS]+?</a>/', $content, $link_matches ) )
		return;
	$site_url = get_bloginfo('url');
	$site_url = substr( $site_url, (int) strpos($site_url, '://') ); // remove the http(s)
	$replace = '';
	foreach ( $link_matches[1] as $key => $value ) {
		if ( !strpos($value, '?attachment_id=') || !strpos($value, 'wp-att-')
			|| !preg_match( '/href=(["'])[^"']*?attachment_id=(d+)[^"']*\1/', $value, $url_match )
			|| !preg_match( '/rel=["'][^"']*wp-att-(d+)/', $value, $rel_match ) )
				continue;
		$quote = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];
		if ( !$url_id || !$rel_id || $url_id != $rel_id || strpos($url_match[0], $site_url) === false )
			continue;
		$link = $link_matches[0][$key];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );
		$content = str_replace( $link, $replace, $content );
	}
	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes($post);
		return wp_update_post($post);
	}
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/_fix_attachment_links/