PHP教程：PHP多线程编程之管道通信实例分析

<?php
class Pipe
{
  public $fifoPath;
  private $w_pipe;
  private $r_pipe;
 
  /**
   * 自动创建一个管道
   *
   * @param string $name 管道名字
   * @param int $mode 管道的权限,默认任何用户组可以读写
   */
  function __construct($name = 'pipe', $mode = 0666)
  {
    $fifoPath = "/tmp/$name." . posix_getpid();
    if (!file_exists($fifoPath)) {
      if (!posix_mkfifo($fifoPath, $mode)) {
        error("create new pipe ($name) error.");
        return false;
      }
    } else {
      error( "pipe ($name) has exit.");
      return false;
    }
    $this->fifoPath = $fifoPath;
  }
///////////////////////////////////////////////////
// 写管道函数开始
///////////////////////////////////////////////////
  function open_write()
  {
    $this->w_pipe = fopen($this->fifoPath, 'w');
    if ($this->w_pipe == NULL) {
      error("open pipe {$this->fifoPath} for write error.");
      return false;
    }
    return true;
  }
 
  function write($data)
  {
    return fwrite($this->w_pipe, $data);
  }
 
  function write_all($data)
  {
    $w_pipe = fopen($this->fifoPath, 'w');
    fwrite($w_pipe, $data);
    fclose($w_pipe);
  }
 
  function close_write()
  {
    return fclose($this->w_pipe);
  }
/////////////////////////////////////////////////////////
/// 读管道相关函数开始
////////////////////////////////////////////////////////
  function open_read()
  {
    $this->r_pipe = fopen($this->fifoPath, 'r');
    if ($this->r_pipe == NULL) {
      error("open pipe {$this->fifoPath} for read error.");
      return false;
    }
    return true;
  }
  function read($byte = 1024)
  {
    return fread($this->r_pipe, $byte);
  }
  function read_all()
  {
    $r_pipe = fopen($this->fifoPath, 'r');
    $data = '';
    while (!feof($r_pipe)) {
      //echo "read one K\n";
      $data .= fread($r_pipe, 1024);
    }
    fclose($r_pipe);
    return $data;
  }
  function close_read()
  {
    return fclose($this->r_pipe);
  }
  /**
   * 删除管道
   *
   * @return boolean is success
   */
  function rm_pipe()
  {
    return unlink($this->fifoPath);
  }
}
?>
 /*
有了这个类,就可以实现简单的管道通信了.*/