Magento su altervista non va

Salve,
sto tentando di installare magento, ma qui arriva il problema

Step 1: Readiness Check

Error! You need to resolve these issues to continue.
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PHP Documentation
PHP Version Check
Your PHP version is . The required PHP version is . Hide detail

Download and install PHP from www.php.net using this PHP Documentation.

For additional assistance, contact your hosting provider.

PHP Settings Check *
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PHP Documentation
Your PHP Version is 5.6.18, but always_populate_raw_post_data = 0. $HTTP_RAW_POST_DATA is deprecated from PHP 5.6 onwards and will be removed in PHP 7.0. This will stop the installer from running. Please open your php.ini file and set always_populate_raw_post_data to -1. If you need more help please call your hosting provider.

For additional assistance, see PHP settings check help .

Cannot determine required PHP extensions: The HOME or COMPOSER_HOME environment variable must be set for composer to run correctly
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PHP Extension Help
PHP Extensions Check
missing PHP extensions. Hide detail

The best way to resolve this is to install the correct missing extensions. The exact fix depends on our server, your host, and other system variables.
Our PHP extension help can get you started.

For additional assistance, contact your hosting provider.

File Permission Check
You meet 4 out of 4 writable file permission requirements. Show detail

* - In some cases, you might have two PHP configuration files: one for the PHP command line and for the web server. If so, make the change in both php.ini files. For details, see the php.ini reference.

che devo fare?

[Gianluca]

millericambi:

la configurazione è stata modificata per eliminare l'errore, verifica se l'installazione ora va a buon fine