Create array from string using php

I have a string like below

Final-Recipient: rfc822;test@example.com
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found

I need to get each value as an associative array like

array('Final-Recipient'=>'rfc822;test@example.com',
      'Action'=>'failed',
      'Status'=>'5.1.1',....)

I was try with explode function,But it don't give result expected.

    $result = array();
    $temp =  explode(';',$message);
    foreach($temp as $value)
    {
     $temp2   = explode(':',$value);
     $result[$temp[0]] = $result[$temp[1]];     
    }
    print_r($result);