配置文件中错误日志路径已经设置了，却还是无法保存到该路径

; Log errors to specified file. PHP's default behavior is to leave this value

; empty.

; http://php.net/error-log

; Example:

;error_log = php_errors.log

; Log errors to syslog (Event Log on NT, not valid in Windows 95).

;error_log = E:/wamp/logs/php_error.log