Warning: Xdebug MUST be loaded as a Zend extension in Unknown on line 0

I don't know why, but this error keeps appearing. After installing xdebug, I
found some information on the Internet, and
finally found one, which is to put ;extension=php_xdebug-2.5.5-5.6-vc11
in php.ini under php
-x86_64.dll is
commented out, then,
keep the zend_extension xdebug under the Php.ini path displayed under PHpinifo