折腾：
【未解决】修复WordPress登录页死循环：wp-config各种设置
期间，试试：
// define('WP_CACHE', true); //Added by WP-Cache Manager
define('WP_CACHE', false);结果：
登录页死循环时会有很多警告
Notice: wp_deregister_script的调用方法不正确。脚本和样式应在wp_enqueue_scripts、admin_enqueue_scripts和login_enqueue_scripts钩子之后再加入加载队列（enqueue）或注册（register）。 This notice was triggered by the l10n handle. 请查阅调试WordPress来获取更多信息。 （这个消息是在3.3.0版本添加的。） in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 5225 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-banner.php on line 11 Deprecated: 在d_banner中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-slidebanner.php on line 11 Deprecated: 在d_slidebanner中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-readers.php on line 11 Deprecated: 在d_reader中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-postlist.php on line 11 Deprecated: 在d_postlist中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-comment.php on line 11 Deprecated: 在d_comment中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-tags.php on line 11 Deprecated: 在d_tag中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-textbanner.php on line 11 Deprecated: 在d_textbanner中为WP_Widget调用的构造函数已自版本4.3.0起废弃！请改用__construct()。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866 Notice: wp_deregister_script的调用方法不正确。不在管理区域中反注册jquery脚本。要将目标定为前端主题，请使用wp_enqueue_scripts钩子。 请查阅调试WordPress来获取更多信息。 （这个消息是在3.6.0版本添加的。） in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 5225 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-login.php on line 521 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-login.php on line 537 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 6270 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-includes/pluggable.php on line 958 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-includes/pluggable.php on line 960 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-includes/pluggable.php on line 961 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-content/plugins/pwa-for-wp/service-work/class-service-worker.php on line 587 错误：Cookies因预料之外的输出被阻止。要获取帮助，请参见此文档或访问支持论坛。
其中的：
Warning: Cannot modify header information - headers already sent by
感觉最可疑，因为别人提到过
错误：Cookies因预料之外的输出被阻止
看起来和缓存有关
所以看来还会恢复WP_CACHE
WordPress解决Cookies因预料之外的输出被阻止-AIDE技术网–技术综合类博客|AIDEZY.COM
结果问题依旧。
不过
错误：Cookies因预料之外的输出被阻止
已经没了，还有其他的：
继续去解决之前的：
Cannot modify header information – headers already sent by
wordpress Cannot modify header information – headers already sent by
How to fix Cannot modify header information – headers already sent | WordPress.org
“Cannot modify header information” | WordPress.org
Warning: Cannot modify header information | WordPress.org
Warning: Cannot modify header information – headers already sent by | WordPress.org
Cannot modify header information – headers already sent by | WordPress.org
说是有空白字符
去看看
trigger_error(
sprintf(
/* translators: Developer debugging message. 1: PHP function name, 2: Explanatory message, 3: WordPress version number. */
__( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s' ),
$function,
$message,
$version
),
E_USER_NOTICE
);
} else {
if ( $version ) {
$version = sprintf( '(This message was added in version %s.)', $version );
}前面的输出，都是这段开始的
再去看看
// Auth cookies. setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN ); setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN ); 。。。
看来都是：setcookie相关的
且在此之前，就有几个同样警告了：
Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-login.php on line 521 Warning: Cannot modify header information - headers already sent by (output started at /data/wwwroot/www.crifan.com/wp-includes/functions.php:5225) in /data/wwwroot/www.crifan.com/wp-login.php on line 537
对应代码：
header( 'Content-Type: ' . get_bloginfo( 'html_type' ) . '; charset=' . get_bloginfo( 'charset' ) ); setcookie( TEST_COOKIE, 'WP Cookie check', 0, COOKIEPATH, COOKIE_DOMAIN, $secure );
有header，也有setcookie
总之，都是无法设置cookie导致的
此处文件末尾，没有多余：
?>
所以此处不是这个问题
另外去恢复之前的：
setcookie( $auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true ); // setcookie( $auth_cookie_name, $auth_cookie, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, $secure, true );
结果：
问题依旧，且又出现了之前的：
错误：Cookies因预料之外的输出被阻止。要获取帮助，请参见此文档或访问支持论坛。
不过，此处cookie可以看到了：
所以：或许是离解决问题，更进了一步？
wordpress Cookies因预料之外的输出被阻止
去掉：
define('WP_HOME','https://www.crifan.com');
// define('WP_SITEURL','https://www.crifan.com');加上：清除缓存
结果：问题依旧
-》难道是此处最近Vultr更新服务器，导致我此处php配置变动？
去找找自己此处的CentOS中php的ini设置如何
先去找找
输出缓冲区数据块设置
对应的是哪个变量
php.ini 输出缓冲区数据块设置
output_buffering = on/off/xK(x为某个整型数值)
去看看自己此处的配置
Vultr/usr/local/php/etc/php.ini
output_buffering = On output_buffering = 4096
是开启的。没问题。
算了，还是没办法。
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