The provided links do not work.  Please update the links or paste the patch directly into the comments.

I'll try to find it in the next days somewhere on my harddrives.

Index: memcache.php
===================================================================
--- memcache.php	(r?vision 300461)
+++ memcache.php	(copie de travail)
@@ -48,12 +48,24 @@
 
 ///////////MEMCACHE FUNCTIONS /////////////////////////////////////////////////////////////////////
 
+function get_host_port_from_server($server){
+	$values = explode( ':', $server );
+	if ( ($values[0] == 'unix' ) && ( !is_numeric( $values[1] ) ) )
+	{
+		return Array( $server, 0 );
+	}
+	else
+	{
+		return values;
+	}
+}
+
 function sendMemcacheCommands($command){
     global $MEMCACHE_SERVERS;
 	$result = array();
 
 	foreach($MEMCACHE_SERVERS as $server){
-		$strs = explode(':',$server);
+		$strs = get_host_port_from_server($server);
 		$host = $strs[0];
 		$port = $strs[1];
 		$result[$server] = sendMemcacheCommand($host,$port,$command);
@@ -110,7 +122,7 @@
 }
 
 function dumpCacheSlab($server,$slabId,$limit){
-    list($host,$port) = explode(':',$server);
+    list($host,$port) = get_host_port_from_server($server);
     $resp = sendMemcacheCommand($host,$port,'stats cachedump '.$slabId.' '.$limit);
 
    return $resp;
@@ -118,7 +130,7 @@
 }
 
 function flushServer($server){
-    list($host,$port) = explode(':',$server);
+    list($host,$port) = get_host_port_from_server($server);
     $resp = sendMemcacheCommand($host,$port,'flush_all');
     return $resp;
 }
@@ -842,7 +854,7 @@
         $theKey = htmlentities(base64_decode($_GET['key']));
 
         $theserver = $MEMCACHE_SERVERS[(int)$_GET['server']];
-        list($h,$p) = explode(':',$theserver);
+        list($h,$p) = get_host_port_from_server($theserver);
         $r = sendMemcacheCommand($h,$p,'get '.$theKey);
         echo <<<EOB
         <div class="info"><table cellspacing=0><tbody>
@@ -865,7 +877,7 @@
         }
         $theKey = htmlentities(base64_decode($_GET['key']));
 		$theserver = $MEMCACHE_SERVERS[(int)$_GET['server']];
-		list($h,$p) = explode(':',$theserver);
+		list($h,$p) = get_host_port_from_server($theserver);
         $r = sendMemcacheCommand($h,$p,'delete '.$theKey);
         echo 'Deleting '.$theKey.':'.$r;
 	break;

This bug has been fixed in SVN.

In case this was a documentation problem, the fix will show up at the
end of next Sunday (CET) on pecl.php.net.

In case this was a pecl.php.net website problem, the change will show
up on the website in short time.
 
Thank you for the report, and for helping us make PECL better.

function get_host_port_from_server($server){
	$values = explode( ':', $server );
	if ( ($values[0] == 'unix' ) && ( !is_numeric( $values[1] ) ) )
	{
		return Array( $server, 0 );
	}
	else
	{
!		return values;
	}
}

This code contents an error. 
"return values;" => "return $values;"