Pre-requirement for troubleshooting

PHP extension error

check “composer” on your system first open command prompt and type “composer”,

PHP Extension error installing During Magento 2

If you seen “composer is not recognized as an internal or External command” so you need install getComposer.exe

OR

if you see screen like “you are running with xdebug enabled this has a major impact on runtime performance.” So composer is already in your system. Go for troubleshooting. when you start installation for magento 2 (http://localhost/your-magento-folder/setup) if your current setting does not match on magento 2 required like some PHP Extensions disabled or not working then you will see below error screen Step-1: Open php.ini (D:/wamp/bin/php/ php5.5.12/php.ini) file and find, Step-2:and comment(;) this Step-3: Restart wampserver and check again. Step-1: open D:/wamp/bin/php/php5.5.12 select all file who start with “icu” Step-2: and paste all file D:/wamp/bin/apache/apaache2.4.9 Step-3: Restart wampserver and check again Yaap! Errors are gone… Your system is ready for install magento 2