How to use array as a selective menu in mail line

[DILEMNE]

I cannot figure out why my array is not working, I have $carrier coming from a text document.The user selects thier carrier, and it is stored in registry.txt. I open it back up, and mail "$number" followed by each carrier's specific address, for example verizon's would be "vtext.com" I would like the array to look at $carrier, and then assign a value. For example, if $carrier = "verizon" , vtext.com. Then, I have the array linked to the mail statement as $number . "@" . $company \[code\]$text = fopen("../data/textmembers/registry.txt","r") or die("couldent open file"); while (!feof($text)) {$name = fgets($text);$number = fgets($text);$carrier = fgets($text);$date = fgets($text);$line = fgets($text);$message .= $content; $message .= "\n";$number = trim($number); $company = array("Verizon" => "vtext.com","AT&T" => "txt.att.net","T-mobile" => "tmomail.net","Sprint" => "messaging.nextel.com" ); $company [$carrier]; mail($number . "@" . $company, "SGA Event Alert", $message, "SGA"); Header("Location: mailconf.php"); }\[/code\]Thanks a lot for the help!