discover_pingback_server_uri( string $url, int $deprecated = '' )

基于给定的URL查找pingback服务器URI。
Finds a pingback server URI based on the given URL.

说明（Description）

检查HTML中rel=“pingback”链接和x-pingback头。它首先检查x-pingback头并返回该头（如果可用）。rel=“pingback”的检查的开销超过了头文件。

参数（Parameters）

返回（Return）

源码（Source）

/**
 * Finds a pingback server URI based on the given URL.
 *
 * Checks the HTML for the rel="pingback" link and x-pingback headers. It does
 * a check for the x-pingback headers first and returns that, if available. The
 * check for the rel="pingback" has more overhead than just the header.
 *
 * @since 1.5.0
 *
 * @param string $url URL to ping.
 * @param int $deprecated Not Used.
 * @return false|string False on failure, string containing URI on success.
 */
function discover_pingback_server_uri( $url, $deprecated = '' ) {
	if ( !empty( $deprecated ) )
		_deprecated_argument( __FUNCTION__, '2.7' );

	$pingback_str_dquote = 'rel="pingback"';
	$pingback_str_squote = 'rel='pingback'';

	/** @todo Should use Filter Extension or custom preg_match instead. */
	$parsed_url = parse_url($url);

	if ( ! isset( $parsed_url['host'] ) ) // Not an URL. This should never happen.
		return false;

	//Do not search for a pingback server on our own uploads
	$uploads_dir = wp_upload_dir();
	if ( 0 === strpos($url, $uploads_dir['baseurl']) )
		return false;

	$response = wp_safe_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );

	if ( is_wp_error( $response ) )
		return false;

	if ( wp_remote_retrieve_header( $response, 'x-pingback' ) )
		return wp_remote_retrieve_header( $response, 'x-pingback' );

	// Not an (x)html, sgml, or xml page, no use going further.
	if ( preg_match('#(image|audio|video|model)/#is', wp_remote_retrieve_header( $response, 'content-type' )) )
		return false;

	// Now do a GET since we're going to look in the html headers (and we're sure it's not a binary file)
	$response = wp_safe_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );

	if ( is_wp_error( $response ) )
		return false;

	$contents = wp_remote_retrieve_body( $response );

	$pingback_link_offset_dquote = strpos($contents, $pingback_str_dquote);
	$pingback_link_offset_squote = strpos($contents, $pingback_str_squote);
	if ( $pingback_link_offset_dquote || $pingback_link_offset_squote ) {
		$quote = ($pingback_link_offset_dquote) ? '"' : ''';
		$pingback_link_offset = ($quote=='"') ? $pingback_link_offset_dquote : $pingback_link_offset_squote;
		$pingback_href_pos = @strpos($contents, 'href=', $pingback_link_offset);
		$pingback_href_start = $pingback_href_pos+6;
		$pingback_href_end = @strpos($contents, $quote, $pingback_href_start);
		$pingback_server_url_len = $pingback_href_end - $pingback_href_start;
		$pingback_server_url = substr($contents, $pingback_href_start, $pingback_server_url_len);

		// We may find rel="pingback" but an incomplete pingback URL
		if ( $pingback_server_url_len > 0 ) { // We got it!
			return $pingback_server_url;
		}
	}

	return false;
}