Magento 2 Installation : PHP Extension intl is shown as missing WAMP

When you install Magento 2 using WAMP. Such Extensions missing error shows often.

Don't worry, I also faced same issue and fixed it using Google & Stackoverflow. Here I explain all the fixes step by step. Hope it will help you.

I mentioned below screen as for example of Extension missing error in 'Readiness Check' step of Magento 2 installation.

Before going to perform steps...
Have you enable php_intl extension ? If not then do it first.
 ;extension=php_intl.dll -- remove semicolong form php.ini

Step 1: First you confirm what is the error actually. So open PHP error log file. refer following screenshot.

PHP log will display the actual warning or error like "
[05-Oct-2015 10:41:17 UTC] PHP Warning:  PHP Startup: Unable to load dynamic library 'E:/wamp/bin/php/php5.5.12/ext/php_intl.dll' - %1 is not a valid Win32 application."

If above warning seems you. Then go to step 2.

Step 2: You have to copy all the files (all files starts with icu*):
icudt.dll
icudt46.dll
icuin.dll
icuin46.dll
icuio.dll
icuio46.dll
icule.dll
icule46.dll
iculx.dll
iculx46.dll
icutest.dll
icutest46.dll
icutu.dll
icutu46.dll
icuuc.dll
icuuc46.dll

From: <wamp_installation_path>/bin/php/php5.4.3/
To: <wamp_installation_path>/bin/apache/apache2.2.22/bin/

Step 3: Restart WAMP and check.

Weldone!!

Source : http://stackoverflow.com/questions/16372888/intl-extension-php-intl-dll-with-wamp