Output control class_PHP tutorial

/**
*
* Author: Xu Zuning (Nagging)
* Email: czjsz_ah@stats.gov.cn
* Developed: 2002.07
*
*
* Category: outbuffer
* Function: Encapsulate some output control functions and control the output object.
*<*>*Method:
*Run ($ PROC) Run the PHP program
*$ PROC PHP program name
*Display () Output operation
*Savetofile ($ FILENAME) Save the running results to a file, which can generally be used to generate static pages
* $filename file name
* loadfromfile($filename) Load the saved file
* $filename file name
*
* Example:
* 1.
* require_once "outbuffer.php";
* $out = new outbuffer();
* $out->run("test.php");
* $out->display();
*
* 2.
* require_once "outbuffer.php";
* require_once "outbuffer.php";
* $out = new outbuffer("test.php");
* $out->savetofile("temp.htm");
*
* 3.
* require_once "outbuffer.php";
* $out = new outbuffer();
* $out->loadfromfile("temp.htm");
* $out->display();
*
*/

class outbuffer {
  var $length;
  var $buffer;
  function outbuffer($proc="") {
    $this->run($proc);
  }
  function run($proc="") {
    ob_start();
    include($proc);
    $this->length = ob_get_length();
    $this->buffer = ob_get_contents();
    $this->buffer = eregi_replace("r?n","rn",$this->buffer);
    ob_end_clean();
  }
  function display() {
    echo $this->buffer;
  }
  function savetofile($filename="") {
    if($filename == "") return;
    $fp = fopen($filename,"w");
    fwrite($fp,$this->buffer);
    fclose($fp);
  }
  function loadfromfile($filename="") {
    if($filename == "") return;
    $fp = fopen($filename,"w");
    $this->buffer = fread($fp,filesize($filename));
    fclose($fp);
  }
}
?>