
WordPress插件开发入门基础教程
check_ajax_referer ( $action = -1, $query_arg = false, $die = true )
check_ajax_referer: 这个函数检查所提供的nonce(一种特殊的安全令牌)是否与WordPress在前一个页面加载时生成的nonce相匹配。它是用来防止跨站请求伪造(CSRF)攻击的。
验证Ajax请求,以防止处理博客外部的请求。
function check_ajax_referer( $action = -1, $query_arg = false, $die = true ) { if ( -1 == $action ) { _doing_it_wrong( __FUNCTION__, __( 'You should specify an action to be verified by using the first parameter.' ), '4.7.0' ); } $nonce = ''; if ( $query_arg && isset( $_REQUEST[ $query_arg ] ) ) { $nonce = $_REQUEST[ $query_arg ]; } elseif ( isset( $_REQUEST['_ajax_nonce'] ) ) { $nonce = $_REQUEST['_ajax_nonce']; } elseif ( isset( $_REQUEST['_wpnonce'] ) ) { $nonce = $_REQUEST['_wpnonce']; } $result = wp_verify_nonce( $nonce, $action ); /** * Fires once the Ajax request has been validated or not. * * @since 2.1.0 * * @param string $action The Ajax nonce action. * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between * 0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. */ do_action( 'check_ajax_referer', $action, $result ); if ( $die && false === $result ) { if ( wp_doing_ajax() ) { wp_die( -1, 403 ); } else { die( '-1' ); } } return $result; } endif; if ( ! function_exists( 'wp_redirect' ) ) : /** * Redirects to another page. * * Note: wp_redirect() does not exit automatically, and should almost always be * followed by a call to `exit;`: * * wp_redirect( $url ); * exit; * * Exiting can also be selectively manipulated by using wp_redirect() as a conditional * in conjunction with the {@see 'wp_redirect'} and {@see 'wp_redirect_location'} filters: * * if ( wp_redirect( $url ) ) { * exit; * } * * @since 1.5.1 * @since 5.1.0 The `$x_redirect_by` parameter was added. * @since 5.4.0 On invalid status codes, wp_die() is called. * * @global bool $is_IIS * * @param string $location The path or URL to redirect to. * @param int $status Optional. HTTP response status code to use. Default '302' (Moved Temporarily). * @param string $x_redirect_by Optional. The application doing the redirect. Default 'WordPress'. * @return bool False if the redirect was canceled, true otherwise. */