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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);
}
?>
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