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Thanks for the reply, I’ve solved it, it was a setup problem inside the PHP

Hi Benni, thank you very much for your answer, I am now reinstalling WordPress and a lot of features don’t work, such as:
1, the language options in settings and the user interface can’t be changed.
2, Elementor and other theme plug-ins can not be updated and saved after editing the interface.
3, WPForms form can not be created, the
4, WooCommerce can not publish products, click edit will automatically jump to the article interface.
I follow the method of Google and chatgpt, can’t solve the problem, I’m very distressed, because there is no such problem before, the

Website Error Logs：
2023/07/21?20:33:36?[error]?3692#0:?*21?FastCGI?sent?in?stderr:?＂PHP?message:?PHP?Warning:??POST?Content-Length?of?375?bytes?exceeds?the?limit?of?256?bytes?in?Unknown?on?line?0＂?while?reading?response?header?from?upstream,?client:?64.42.176.106,?server:?sihancn.com,?request:?＂POST?/wp-admin/admin-ajax.php?HTTP/2.0＂,?upstream:?＂fastcgi://unix:/tmp/php-cgi-74.sock:＂,?host:?＂www.sihancn.com＂,?referrer:?＂https://www.sihancn.com/wp-admin/themes.php?page＝starter-templates&ci＝2＂
2023/07/21?20:33:37?[error]?3692#0:?*21?FastCGI?sent?in?stderr:?＂PHP?message:?PHP?Warning:??POST?Content-Length?of?267?bytes?exceeds?the?limit?of?256?bytes?in?Unknown?on?line?0＂?while?reading?response?header?from?upstream,?client:?64.42.176.106,?server:?sihancn.com,?request:?＂POST?/wp-admin/admin-ajax.php?HTTP/2.0＂,?upstream:?＂fastcgi://unix:/tmp/php-cgi-74.sock:＂,?host:?＂www.sihancn.com＂,?referrer:?＂https://www.sihancn.com/wp-admin/themes.php?page＝starter-templates&ci＝3＂
2023/07/21?20:33:37?[error]?3692#0:?*21?FastCGI?sent?in?stderr:?＂PHP?message:?PHP?Warning:??POST?Content-Length?of?278?bytes?exceeds?the?limit?of?256?bytes?in?Unknown?on?line?0＂?while?reading?response?header?from?upstream,?client:?64.42.176.106,?server:?sihancn.com,?request:?＂POST?/wp-admin/admin-ajax.php?HTTP/2.0＂,?upstream:?＂fastcgi://unix:/tmp/php-cgi-74.sock:＂,?host:?＂www.sihancn.com＂,?referrer:?＂https://www.sihancn.com/wp-admin/themes.php?page＝starter-templates&ci＝3＂
2023/07/21?20:34:18?[error]?3692#0:?*21?FastCGI?sent?in?stderr:?＂PHP?message:?PHP?Warning:??Unknown:?POST?Content-Length?of?498?bytes?exceeds?the?limit?of?256?bytes?in?Unknown?on?line?0＂?while?reading?response?header?from?upstream,?client:?64.42.176.106,?server:?sihancn.com,?request:?＂POST?/wp-admin/options.php?HTTP/2.0＂,?upstream:?＂fastcgi://unix:/tmp/php-cgi-74.sock:＂,?host:?＂www.sihancn.com＂,?referrer:?＂https://www.sihancn.com/wp-admin/options-general.php＂