Wordpress 相对路径

relative.php

/*wp-config.php*/  
/*设置相对路径*/  
define('WP_HOME', 'http://'.$_SERVER['HTTP_HOST']);
define('WP_SITEURL', 'http://'.$_SERVER['HTTP_HOST']);

/* wp-includes/post.php 注意加注释的地方的$url */   
/* 设置图片附件为相对路径 */
function wp_get_attachment_url( $attachment_id = 0 ) {
// ...
	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
		// Get upload directory.
		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				//$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
				$url = $file_dir . "/wp-content/uploads/" . $file;
			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				//$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
				$url = $file_dir . "/wp-content/uploads/" . $file;
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				//$url = $uploads['baseurl'] . "/$file";
				$url = $file_dir . "/wp-content/uploads/" . $file;
			}
		}
	}

}