I get similar errors in my error_log in php when users are uploading their files
PHP Warning: POST Content-Length of 11933650 bytes exceeds the limi
There might be more than just one php.ini file. For example, when using WAMP there are 2 php.ini files in following directories:
C:\wamp\bin\apache\apache2.4.9\bin
C:\wamp\bin\php\php5.5.12
You need to edit the first one.