php ajax message board_PHP tutorial

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php教程 ajax 留言板
提供一款国人写的php ajax 留言板,他是利用了jquery php mysql教程 ajax来实现php ajax 局部刷新留方板实例的喜欢就下载吧。
*/
$link = @mysql_connect($db_host,$db_user,$db_pass) or die('unable to establish a db connection');

mysql_query("set names 'utf8'");
mysql_select_db($db_database,$link);

class comment
{
 private $data = array();
 
 public function __construct($row)
 {
  /*
  / the constructor
  */
  
  $this->data = $row;
 }
 
 public function markup()
 {
  /*
  / this method outputs the xhtml markup of the comment
  */
  
  // setting up an alias, so we don't have to write $this->data every time:
  $d = &$this->data;
  
  $link_open = '';
  $link_close = '';
  
  if($d['url']){
   
   // if the person has entered a url when adding a comment,
   // define opening and closing hyperlink tags
   
   $link_open = '';
   $link_close =  '';
  }
  
  // converting the time to a unix timestamp:
  $d['dt'] = strtotime($d['dt']);
  
  // needed for the default gravatar image:
  $url = 'http://'.dirname($_server['server_name'].$_server["request_uri"]).'/img/default_avatar.gif';
  
  return '
  
   

    

     '.$link_open.'
     
     '.$link_close.'
    

    
    

'.$link_open.$d['name'].$link_close.'

    

'.date('d m y',$d['dt']).'

    

'.$d['body'].'

   

  ';
 }
 
 public static function validate(&$arr)
 {
  /*
  / this method is used to validate the data sent via ajax.
  /
  / it return true/false depending on whether the data is valid, and populates
  / the $arr array passed as a paremter (notice the ampersand above) with
  / either the valid input data, or the error messages.
  */
  
  $errors = array();
  $data = array();
  
  // using the filter_input function introduced in php 5.2.0
  
  if(!($data['email'] = filter_input(input_post,'email',filter_validate_email)))
  {
   $errors['email'] = 'please enter a valid email.';
  }
  
  if(!($data['url'] = filter_input(input_post,'url',filter_validate_url)))
  {
   // if the url field was not populated with a valid url,
   // act as if no url was entered at all:
   
   $url = '';
  }
  
  // using the filter with a custom callback function:
  
  if(!($data['body'] = filter_input(input_post,'body',filter_callback,array('options'=>'comment::validate_text'))))
  {
   $errors['body'] = 'please enter a comment body.';
  }
  
  if(!($data['name'] = filter_input(input_post,'name',filter_callback,array('options'=>'comment::validate_text'))))
  {
   $errors['name'] = 'please enter a name.';
  }
  
  if(!empty($errors)){
   
   // if there are errors, copy the $errors array to $arr:
   
   $arr = $errors;
   return false;
  }
  
  // if the data is valid, sanitize all the data and copy it to $arr:
  
  foreach($data as $k=>$v){
   $arr[$k] = mysql_real_escape_string($v);
  }
  
  // ensure that the email is lower case:
  
  $arr['email'] = strtolower(trim($arr['email']));
  
  return true;
  
 }

 private static function validate_text($str)
 {
  /*
  / this method is used internally as a filter_callback
  */
  
  if(mb_strlen($str,'utf8')   return false;
  
  // encode all html special characters (, ", & .. etc) and convert
  // the new line characters to
tags:
  
  $str = nl2br(htmlspecialchars($str));
  
  // remove the new line characters that are left
  $str = str_replace(array(chr(10),chr(13)),'',$str);
  
  return $str;
 }

}

$comments = array();
$result = mysql_query("select * from comments order by id asc");

while($row = mysql_fetch_assoc($result))
{
 $comments[] = new comment($row);
}

?>