(PECL apd >= 0.2)
apd_set_session_trace_socket — Starts the remote session debugging
$tcp_server
   , int $socket_type
   , int $port
   , int $debug_level
   ) : bool
   Connects to the specified tcp_server (eg. tcplisten)
   and sends debugging data to the socket. 
  
tcp_serverIP or Unix Domain socket (like a file) of the TCP server.
socket_type
       Can be AF_UNIX for file based sockets or 
       APD_AF_INET for standard tcp/ip.
      
portYou can use any port, but higher numbers are better as most of the lower numbers may be used by other system services.
debug_level由加上 XXX_TRACE 常量而形成的整数。
不建议使用
MEMORY_TRACE。这会很慢且似乎不精确。
ASSIGNMENT_TRACE 还未被实现。
要打开所有跟踪功能(TIMING, FUNCTIONS, ARGS SUMMARY (比如 strace -c)) 则使用 99 作为值。
   成功时返回 TRUE, 或者在失败时返回 FALSE。
  
Example #1 apd_set_session_trace_socket() example
<?php
  apd_set_session_trace_socket("127.0.0.1",APD_AF_INET,7112,0);
?>