看见Determining Plugin and Content Directories.

plugins_url( \'filename\', __FILE__ );

get_stylesheet_directory_uri() . \'/path/to/file\';

使用ABSPATH和home_url() 如果wp安装位于与其显示的url不同的目录中，则可能无法工作。你应该测试一下。

我的想法是，使用内容目录作为替换的位置可能更可靠，因为您可以将生成的路径传递到content_url() 说明WP安装的位置：

function get_file_url( $file = __FILE__ ) {
    $file_path = str_replace( "\\\\", "/", str_replace( str_replace( "/", "\\\\", WP_CONTENT_DIR ), "", $file ) );
    if ( $file_path )
        return content_url( $file_path );
    return false;
}

为什么不写两个案例并检查哪一个实际指向真实文件：

function dogbert_library_get_file_path($filename) {
    // As you might put your file in a folder, just configure this path
    $path_to_file = "files/" .$filename;

    // get_theme_root() doesn\'t give trailing slash
    $themeFile = get_theme_root() ."/" .get_current_theme() ."/" .$path_to_file;
    // plugin_dir_path does give trailing slash
    $pluginFile = plugin_dir_path( __FILE__ ) .$path_to_file ;

    // As we are at filesystem layer, we can use file_exists to check
    if(file_exists($themeFile)){
        return $themeFile;
    } else if(file_exists($pluginFile)) {
        return $pluginFile;
    } else {
        // Return empty as a fallback...
       return "";
    }
}

我建议你用过滤器。

在您的文件中，在最开始的某个地方，包括以下内容：

add_filter( \'wpa45165_resource_url\', \'wpa45165_resource_url_finder\' );
function wpa45165_resource_url_finder( $url ) {
    $url = /* Some code to generate the url from WP_SITEURL and dirname() */;

    return $url;
}

$include_url = apply_filters( \'wpa45165_resource_url\', \'\' );

TL;DR

$themes_search_index = strpos(__FILE__,\'wp-content/themes\');
$plugins_search_index = strpos(__FILE__,\'wp-content/plugins\');
$url_postfix_prospect = dirname(__FILE__);

if( $themes_search_index !== false ){
    $url_postfix_index = strpos($url_postfix_prospect,\'wp-content/themes\');
} elseif( $plugins_search_index !== false ) {
    $url_postfix_index = strpos($url_postfix_prospect,\'wp-content/plugins\');
}

$url_prefix = get_site_url();
$url_postfix = substr($url_postfix_prospect, $url_postfix_index);
$lib_path_url = $url_prefix .\'/\'. $url_postfix;

echo $lib_path_url;

Given the file path...

/var/www/html/example.com/wp-content/plugins/my-plugin/lib/an-awesome-library/autoload.php

Results to...

http://example.com/wp-content/plugins/my-plugin/lib/an-awesome-library

Problem

Building a plug-and-play library for wordpress that can either be "included" inside a theme or plugin can be difficult. Wordpress has no pre-defined function for getting the URL of that file.

Solution

Treat plugins and themes separately.

Step 1. Check whether included inside theme or plugin

/**
 * Contains numeric values if the respective strings are found,
 * Contains boolean `false` if the string is not found
 */
$themes_search_index = strpos(__FILE__,\'wp-content/themes\');
$plugins_search_index = strpos(__FILE__,\'wp-content/plugins\');

Step 2a. If inside a theme

$url_postfix_prospect = dirname(__FILE__);

$url_postfix_index = strpos($url_postfix_prospect,\'wp-content/themes\');
$url_prefix = get_site_url();
$url_postfix = substr($url_postfix_prospect, $url_postfix_index);
$lib_path_url = $url_prefix .\'/\'. $url_postfix;

echo $lib_path_url;

Step 2b. If inside a plugin

$url_postfix_prospect = dirname(__FILE__);

$url_postfix_index = strpos($url_postfix_prospect,\'wp-content/plugins\');
$url_prefix = get_site_url();
$url_postfix = substr($url_postfix_prospect, $url_postfix_index);
$lib_path_url = $url_prefix .\'/\'. $url_postfix;

echo $lib_path_url;

$path = dirname(__FILE__);