php ajax 留言板

时间：2010-11-01 编辑：简简单单来源：一聚教程网

代码如下

复制代码

$link = @mysql_connect($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')<1)
   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);
}

simple ajax commenting system | tutorialzine demo

css教程" href="styles.css" />

/*
/ output the comments one by one:
*/

foreach($comments as $c){
echo $c->markup();
}

add a comment

数据库教程结构

代码如下

复制代码

--
-- table structure for table `comments`
--

create table `comments` (
`id` int(10) unsigned not null auto_increment,
`name` varchar(128) collate utf8_unicode_ci not null default '',
`url` varchar(255) collate utf8_unicode_ci not null default '',
`email` varchar(255) collate utf8_unicode_ci not null default '',
`body` text collate utf8_unicode_ci not null,
`dt` timestamp not null default '0000-00-00',
primary key (`id`)
) engine=myisam default charset=utf8 collate=utf8_unicode_ci;

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