Global variabele binnen functies gebruiken?

<?php 

$sock; 

function opensocket() 
{ 
   global $sock; 
   $address = '156.34.234.34';  //$address = '156.34.234.34'; 
   $port = 6000;                //$port = 6000; 
  //connectie met socket ed 
   if (($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP )) < 0) 
   { 
   echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n"; 
   } 

if (($ret = socket_connect($sock, $address, $port)) < 0) 
  { 
   echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n"; 
  } 
}  //end opensocket 

function writesocket($msg) 
  { 
   global $sock; 
   socket_write($sock, $msg, strlen($msg)); 
  }  //end writesocket 

?> 

<?php 
 
$sock; 
 
function opensocket() 
{ 
   global $sock; 
   $address = '156.34.234.34';  //$address = '156.34.234.34'; 
   $port = 6000;                //$port = 6000; 
  //connectie met socket ed 
   if (($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP )) < 0) 
   { 
   echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n"; 
   } 
 
if (($ret = socket_connect($sock, $address, $port)) < 0) 
  { 
   echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n"; 
  } 
}  //end opensocket 
 
function writesocket($msg) 
  { 
   global $sock; 
   socket_write($sock, $msg, strlen($msg)); 
  }  //end writesocket 
 
?>

<?
function opensocket()
{
   $address = '156.34.234.34';  //$address = '156.34.234.34';
   $port = 6000;                //$port = 6000;
  //connectie met socket ed
   if (($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP )) < 0)
   {
   echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n";
   }

if (($ret = socket_connect($sock, $address, $port)) < 0)
  {
   echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n";
  }
return $sock;
}  //end opensocket

function writesocket($msg,$sock)
  {
   socket_write($sock, $msg, strlen($msg));
  }  //end writesocket
writesocket('mijn bericht',opensocket());?>

<?
function opensocket()
{
   $address = '156.34.234.34';  //$address = '156.34.234.34';
   $port = 6000;                //$port = 6000;
  //connectie met socket ed
   if (($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP )) < 0)
   {
   echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n";
   }
 
if (($ret = socket_connect($sock, $address, $port)) < 0)
  {
   echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n";
  }
return $sock;
}  //end opensocket
 
function writesocket($msg,$sock)
  {
   socket_write($sock, $msg, strlen($msg));
  }  //end writesocket
writesocket('mijn bericht',opensocket());?>