简单实用方便的ajax评论完整代码

简单的ajax评论完整代码

数据库结构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 CURRENT_TIMESTAMP,

PRIMARY KEY  (`id`)

) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1;

 

演示

PHP 

[php]  

// Error reporting:  

error_reporting(E_ALL^E_NOTICE);  

include "conn.php";  

include "comment.class.php";  

/* （PS：^_^不错的php学习交流群：276167802，验证：csl，有兴趣的话可以加入进来一起讨论） 

/   Select all the comments and populate the $comments array with objects 

*/  

$comments = array();  

$result = mysql_query("SELECT * FROM comments ORDER BY id ASC");  

while($row = mysql_fetch_assoc($result))  

{  

$comments[] = new Comment($row);  

}  

?>  

 

PHP 

[php]  

 

/* 

/   Output the comments one by one: 

*/  

foreach($comments as $c){  

echo $c->markup();  

}  

?>  

 

Add a Comment

 

 

 

Your Name  

 

Your Email  

 

Website (not required)  

 

Comment Body  

 

 

 

 

 

 

submit.php  

 

PHP 

[php]  

// Error reporting:  

error_reporting(E_ALL^E_NOTICE);  

include "conn.php";  

include "comment.class.php";  

/* 

/   This array is going to be populated with either 

/   the data that was sent to the script, or the 

/   error messages. 

/*/  

$arr = array();  

$validates = Comment::validate($arr);  

if($validates)  

{  

/* Everything is OK, insert to database: */  

mysql_query("   INSERT INTO comments(name,url,email,body)  

VALUES (  

'".$arr['name']."',  

'".$arr['url']."',  

'".$arr['email']."',  

'".$arr['body']."'  

)");  

$arr['dt'] = date('r',time());  

$arr['id'] = mysql_insert_id();  

/* 

/   The data in $arr is escaped for the mysql query, 

/   but we need the unescaped variables, so we apply, 

/   stripslashes to all the elements in the array: 

/*/  

$arr = array_map('stripslashes',$arr);  

$insertedComment = new Comment($arr);  

/* Outputting the markup of the just-inserted comment: */  

echo json_encode(array('status'=>1,'html'=>$insertedComment->markup()));  

}  

else  

{  

/* Outputtng the error messages */  

echo '{"status":0,"errors":'.json_encode($arr).'}';  

}  

?>  

comment.class.php  

 

PHP 

[php] 

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;  

}  

}  

?>  

 

以上是本文关于ajax评论的完整代码，希望本文对广大php开发者有所帮助，感谢阅读本文。