Suddenly, my website access returned empty content. I saw no error in the php error log and turned on display_error to display the page normally. shallwe.net A classmate gave me a suggestion, execute /usr/local/zeus/php/php .fcgi index.php, the result returns size exceed limit, and then strace it, it turns out that an error occurred when opening the php error log file. It seems that this file is 2g. Clear it. It works.