**一.Socket資源遷移到Socket對象** #php可使用socket編寫成熟的服務器端程序   **二.查看類型** ``` $socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp')); ```   **三.socket編程** #默認php中的socket是單進程通訊 #啟用pcntl模塊可支持多進程通訊 1.創建socket對象 ``` $socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp')); ``` 2.進程監聽ip和端口 ``` socket_bind($socket,'192.168.2.1',20004); socket_listen($socket); ``` 3.生成客戶端連接 ``` $connection = socket_accept($socket); ``` 4.獲取客戶端信息 ``` socket_getpeername($connection,$cip,$cport); ``` 5.設置歡迎語 ``` $buffer = "Welcome To PHP8\n"; if($buffer != ""){ socket_write($connection,"{$buffer}\n"); } ``` 6.從客戶端讀取數據 ``` $data = socket_read($connection, 1024,PHP_NORMAL_READ) ``` 7.服務端打印數據 ``` printf("{$cip}:{$cport}-->{$buffer}\n"); ``` 8.向客戶端寫入數據 ``` socket_write($connection,"{$cip}:{$cport}-->{$buffer}\n"); ``` 9.客戶端連接斷開 ``` socket_close($connection); printf("{$cip}:{$cport} disconnected\n"); ```   **四.socket單進程完整實例** ``` $socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp')); socket_bind($socket,'192.168.2.1',20004); socket_listen($socket); while(true){ $connection = socket_accept($socket); socket_getpeername($connection,$cip,$cport); $buffer = "Welcome To PHP8\n"; if($buffer != ""){ socket_write($connection,"{$buffer}\n"); } while($data = socket_read($connection, 1024,PHP_NORMAL_READ)){ $buffer = $data; printf("{$cip}:{$cport}-->{$buffer}\n"); socket_write($connection,"{$cip}:{$cport}-->{$buffer}\n"); } socket_close($connection); printf("{$cip}:{$cport} disconnected\n"); } ```   **五.socket程序商用** #php.ini ``` display_errors = Off ```