In performing some further research into the matter I realized that I was trying to write a file that didn't exist. Here is the new code that works great, but I still need some assistance in appending the written file. I've tried all variations of the fopen() (e.g. a,a+, w, etc...) I do not want my inventory to get bloated, so when a person checks the inventory I need the xml file written over with a fresh 'check of the inventory'.

PHP Code:
 
<?php 
#
   
$path "/cdmapi/dlapi.asmx/DLAPI?Request=retail_inv&DealerID=4229&LoginID=lrsa&Password=cdmd@ta";
   
$port 80;
   
$host "api.cdmdata.com";
 
   if (
count($argv) > 1$path $argv[1];
   if (
count($argv) > 2$port $argv[2];
   if (
count($argv) > 3$host $argv[3];
   
$address gethostbyname($host);
   
$socket socket_create(AF_INETSOCK_STREAMSOL_TCP);
   
socket_connect($socket$address$port);
   
$in "GET $path HTTP/1.0\r\n\r\n";
   
socket_write($socket$instrlen($in));
   while (
$data socket_read($socket2048)) {
      
//echo $out;
 
  
$file "inventory.xml";
  
$content $data;
 
  if (
is_writable($file)){
 
   if (!
$handle fopen($file'a')){
    echo 
"Cannot open file ($file)";
    exit;
   }
 
   if (
fwrite($handle$content) === FALSE) {
    echo 
"Cannot write to ($file)";
    exit;
   }
 
   echo 
"Success, wrote ($content) to file ($file)";
 
   
fclose($handle);
 
  } else {
   echo 
"the file $file is not writable";
   }
}
   
socket_close($socket);
 
?>