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if ( !is_multisite() ) {wp_redirect( site_url( ‘/wp-login.php?action=register‘ ) );//將使用者重新導向到一個預先制定的絕對URI

die(); }
$wp_query->is_404 = false; //$wp_query 是在wp-blog-header.php檔案中定義的一個WP_Query實體物件，它提供了當前請求的資訊。->這個符號訪問類執行個體的屬性、方法；

// is_multisite()函數源碼,是wordpress自己定義的一個函數
function is_multisite() {if ( defined( ‘MULTISITE‘ ) )return MULTISITE;if ( defined( ‘SUBDOMAIN_INSTALL‘ ) || defined( ‘VHOST‘ ) || defined( ‘SUNRISE‘ ) )return true;return false;}


//函數源碼：

function wp_redirect($location, $status = 302) {

global $is_IIS;/** * Filter the redirect location. * * @since 2.1.0 * * @param string $location The path to redirect to. * @param int    $status   Status code to use. */$location = apply_filters( ‘wp_redirect‘, $location, $status );/** * Filter the redirect status code. * * @since 2.3.0 * * @param int    $status   Status code to use. * @param string $location The path to redirect to. */$status = apply_filters( ‘wp_redirect_status‘, $status, $location );if ( ! $location )return false;$location = wp_sanitize_redirect($location);if ( !$is_IIS && php_sapi_name() != ‘cgi-fcgi‘ )status_header($status); // This causes problems on IIS and some FastCGI setupsheader("Location: $location", true, $status);return true;}

　　

　　

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