PHP: No php.ini file

Question

I just started to learn PHP and in order to do that I installed wampserver on my windows 8.1. When I try to launch, it works properly but I have two problems:

1) I have

Answer 1

after installation of php you must rename file php-production.ini to php.ini. Those files in your root php directory installed.

For mbstring you must enable this extension. For that you must uncomment the line in your php.ini file (renamed just before) :

;extension = php_mbstring.dll

Check if you have this line in your php.ini :

[mbstring] 
mbstring.language = all 
mbstring.internal_encoding = UTF-8 
mbstring.http_input = auto 
mbstring.http_output = UTF-8 
mbstring.encoding_translation = On 
mbstring.detect_order = UTF-8 
mbstring.substitute_character = none; 
mbstring.func_overload = 0 
mbstring.strict_encoding = Off