problem with passing global variable

[athlone]

I installed myInfo mod but it didn't work!
Eventually I discovered down why myInfo MOD wasn't working.
It takes a parameter from viewtopic.php and passes it to myInfo.php for parsing - only the parameter ($myInfo_user_id) wasn't getting passed on.
So I tried making it global by putting it in a function (function zb()) in viewtopic.php:

function zb()
{
global $myInfo_user_id;
}	
// Start - myInfo MOD - ErDrRon
	$myInfo_user_id = $postrow[$i]['poster_id'];
// My First Function - Zvi Bar - End
	$temp_url =  "javascript:window.open('includes/myInfo.php?p=$myInfo_user_id','_myInfo','width=500,height=300,resizable=yes');void(0);";
	$myInfo_img = '<a href="' . $temp_url . '"><img src="'  . $images['myInfo'] . '" alt="' . $lang['myInfo'] . '" title="' . $lang['myInfo'] . '" border="0" /></a>';
// End - myInfo MOD - ErDrRon

and then calling it in myInfo.php:

zb();
$p = $myInfo_user_id;
$sql = "SELECT username, user_info FROM " . USERS_TABLE . " WHERE user_id = '$p'";where the function is zb() and the variable is '$myInfo_user_id'.

But I get an error message that he function hasn't been defined.
Does anyone know how and where I have to define it?

[devinemke]

you do not want/need a function for this. $myInfo_user_id will be available in your myInfo.php script as $_GET['myInfo_user_id '].

[athlone]

Thanks Devinemke, I tried that:
myinfo.php code:

$_GET['$myInfo_user_id'];
$p = $myInfo_user_id; 
$sql = "SELECT username, user_info FROM " . USERS_TABLE . " WHERE user_id = '$p'";

But apparently it reads 'myinfo_user_id' as value '0', whereas in the URL of the same jumpbox, it reads it as '2' (../includes/myInfo.php?p=2).
viewtopic.php code:

"javascript:window.open('includes/myInfo.php?p=$myInfo_user_id','_myInfo','width=500,height=300,resizable=yes');void(0);"