Functions.php上未定义$_GET和&_REQUEST索引

我最近尝试学习为我的自定义主题创建一个主题选项页面，这是按照stackoverflow和其他资源的教程进行的。但脚本显示错误

if ($_GET[\'page\'] == basename(__FILE__)) {
    if (\'save\' == $_REQUEST[\'formaction\']) {
        foreach ($options as $value) {
            if( isset( $_REQUEST[ $value[\'id\'] ] ) ) {
                update_option( $value[\'id\'], $_REQUEST[ $value[\'id\'] ]  );
            }
            else {
                delete_option( $value[\'id\'] );
            }
        }

        foreach ($spawned_options as $value) {
            if( isset( $_REQUEST[ $value[\'id\'] ] ) ) {
                update_option( $value[\'id\'], $_REQUEST[ $value[\'id\'] ]  );
            }
            else {
                delete_option( $value[\'id\'] );
            }
        }
        header("Location: themes.php?page=options.php&saved=true");
        die;
    }
    else if(\'reset_all\' == $_REQUEST[\'formaction\']) {
        foreach ($options as $value) {
            delete_option( $value[\'id\'] );
        }

        foreach ($spawned_options as $value) {
            delete_option( $value[\'id\'] );
        }
        header("Location: themes.php?page=options.php&".$_REQUEST[\'formaction\']."=true");
        die;
    }

}

我在这条线上出错了

if ($_GET[\'page\'] == basename(__FILE__)) {
    if (\'save\' == $_REQUEST[\'formaction\']) {

错误消息显示“注意：未定义索引：第页…”和“注意：未定义索引：形式…”

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