Explication détaillée des exemples d'applications client et serveur de socket php

<?php
class SocketServer{
  private $_port=&#39;9000&#39;;
  private $_address=&#39;127.0.0.1&#39;;
  private $_client_socket_list=array();
  public function set($name,$val){
    $this--->$name=$val;
  }
  private function _showError($error){
    exit($error);
  }
  /**
   * 开始进行socket服务器端监听端口
   */
  public function start(){
    // 创建端口
    if (($sock = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP )) === false) {
      $this->_showError("socket_create() failed :reason:" . socket_strerror ( socket_last_error () ));
    }
    // 绑定
    if (socket_bind ( $sock, $this->_address, $this->_port ) === false) {
      $this->_showError("socket_bind() failed :reason:" . socket_strerror ( socket_last_error ( $sock ) ));
    }
    // 监听
    if (socket_listen ( $sock, 5 ) === false) {
      $this->_showError("socket_bind() failed :reason:" . socket_strerror ( socket_last_error ( $sock ) ) );
    }
    do {
      //当有一个客户端连接的时候
      if ($client_socket=socket_accept ( $sock )) {
        $count = count ( $this->_client_socket_list ) + 1;
        //把新来的用户加入 客户端数组里
        $this->_client_socket_list[]=$client_socket;
        echo "new connection:\r\n";//服务器端输出当前正在连接的客户端数量
        echo "current connection:{$count}\r\n";
        //接受客户端传过来的字符串
        $msg=$this->read($client_socket);
        echo "client:{$msg}\r\n";
        //服务器向客户端传值
        $my_msg="I am fine,think you\r\n";
        $this->send($client_socket,$my_msg);
      }
      /**
       * 这段代码给你参考,用来判断是否有客户端主动失去连接
      else{
        foreach ( $this->_client_socket_list as $socket ) {
          $len = socket_recv ($socket, $buffer, 2048, 0 ); // 接受一下客户端信息,如果为0代表断开连接
          if ($len < 7) {
            //这里写是去连接的客户端业务
          }
        }
      }
       */
    }while(true);  
  }
  /**
   * 发送数据给客户端
   */
  public function send($client_socket,$str){ 
    return socket_write ( $client_socket,$str, strlen ( $str ) );
  }
  /**
   * 从客户端接受数据
   */
  public function read($client_socket){
    return socket_read ( $client_socket, 8192 );//8192实际代表的接受长度,我用819292表示长一点,这样长一点的字符串也可以接受到,不到8192也没关系,会自动识别
  }
}
$socket_server =new SocketServer();
$socket_server->start();//开始监听

<?php
class SocketServer{
  private $_port=&#39;9000&#39;;
  private $_address=&#39;127.0.0.1&#39;;
  private $_client_socket_list=array();
  public function set($name,$val){
    $this--->$name=$val;
  }
  private function _showError($error){
    exit($error);
  }
  /**
   * 开始进行socket服务器端监听端口
   */
  public function start(){
    // 创建端口
    if (($sock = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP )) === false) {
      $this->_showError("socket_create() failed :reason:" . socket_strerror ( socket_last_error () ));
    }
    // 绑定
    if (socket_bind ( $sock, $this->_address, $this->_port ) === false) {
      $this->_showError("socket_bind() failed :reason:" . socket_strerror ( socket_last_error ( $sock ) ));
    }
    // 监听
    if (socket_listen ( $sock, 5 ) === false) {
      $this->_showError("socket_bind() failed :reason:" . socket_strerror ( socket_last_error ( $sock ) ) );
    }
    do {
      //当有一个客户端连接的时候
      if ($client_socket=socket_accept ( $sock )) {
        $count = count ( $this->_client_socket_list ) + 1;
        //把新来的用户加入 客户端数组里
        $this->_client_socket_list[]=$client_socket;
        echo "new connection:\r\n";//服务器端输出当前正在连接的客户端数量
        echo "current connection:{$count}\r\n";
        //接受客户端传过来的字符串
        $msg=$this->read($client_socket);
        echo "client:{$msg}\r\n";
        //服务器向客户端传值
        $my_msg="I am fine,think you\r\n";
        $this->send($client_socket,$my_msg);
      }
      /**
       * 这段代码给你参考,用来判断是否有客户端主动失去连接
      else{
        foreach ( $this->_client_socket_list as $socket ) {
          $len = socket_recv ($socket, $buffer, 2048, 0 ); // 接受一下客户端信息,如果为0代表断开连接
          if ($len < 7) {
            //这里写是去连接的客户端业务
          }
        }
      }
       */
    }while(true);  
  }
  /**
   * 发送数据给客户端
   */
  public function send($client_socket,$str){ 
    return socket_write ( $client_socket,$str, strlen ( $str ) );
  }
  /**
   * 从客户端接受数据
   */
  public function read($client_socket){
    return socket_read ( $client_socket, 8192 );//8192实际代表的接受长度,我用819292表示长一点,这样长一点的字符串也可以接受到,不到8192也没关系,会自动识别
  }
}
$socket_server =new SocketServer();
$socket_server->start();//开始监听