execute variable as PHP

[hackalive]

Hi guys,

I have a PHP variable $var which is "$header = 'http://'.$_SERVER['HTTP_HOST'].'/'; header("location: $header");"

now some how in my php file I need to execute this variable as PHP

 

any ideas, all help is much appreciated

[hackalive]

or sometimes it might just be "echo $_SERVER['HTTP_HOST'];"

[hackalive]

FYI: I have tried exec() with no luck

[mikesta707]

eval()

 

but if you are executing user input, thats not such a good idea