PHP-FPM doesn't write to error log

见链接：https://stackoverflow.com/questions/8677493/php-fpm-doesnt-write-to-error-log 

1.修改/etc/php-fpm.d/www.conf中：

catch_workers_output = yes
php_admin_value[error_log] = /var/log/fpm-php.www.log
php_admin_flag[log_errors] = on