Description:
------------
I encountered a memory leak issue when creating an SSL enabled socket server in a long lived process. When an incoming listening socket is accepted on either the SSL or TLS protocol, the &$peer passthrough variable in the stream_socket_accept function causes a memory leak.

NOTE: The test script below needs a valid certificate.pem file to work!!
NOTE: The test script spawns a webserver to be reached on 127.0.0.1:8888
NOTE: Testing can be done in a browser by choosing appropriate protocol (http/https) and perform regular page refreshes

Test matrix:
SSL=true, PEER=true   -> memory leak!
SSL=false, PEER=true  -> no memory leak
SSL=true, PEER=false  -> no memory leak
SSL=false, PEER=false -> no memory leak

Test script:
---------------
define('SSL', true);
define('PEER', true);

$context = stream_context_create();
stream_context_set_option($context, 'ssl', 'local_cert', 'certificate.pem');
stream_context_set_option($context, 'ssl', 'passphrase', 'password');
stream_context_set_option($context, 'ssl', 'allow_self_signed', true);

if(SSL) {
   $server = stream_socket_server("ssl://0.0.0.0:8888", $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $context);
} else {
   $server = stream_socket_server("tcp://0.0.0.0:8888", $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN);
}

while(true) {
   if(PEER) { $client = @stream_socket_accept($server, 2, $peer); } else { $client = @stream_socket_accept($server, 2); }
   if($client === false) continue;
   @fwrite($client, "HTTP/1.1 200 OK\r\n\r\nMemory usage: ".memory_get_usage().' bytes');
   @fclose($client);
}

Expected result:
----------------
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes
Memory usage: 641032 bytes

Actual result:
--------------
Memory usage: 641368 bytes
Memory usage: 641560 bytes
Memory usage: 641752 bytes
Memory usage: 641944 bytes
Memory usage: 642232 bytes
Memory usage: 642424 bytes
Memory usage: 642616 bytes
Memory usage: 642808 bytes
Memory usage: 643000 bytes
Memory usage: 643192 bytes
Memory usage: 643384 bytes
Memory usage: 643576 bytes