簡單的ajax評論完整代碼資料庫結構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; 示範PHP [php] <?php // Error reporting: error_reporting(E_ALL^E_NOTICE); include "conn.php"; include "comment.class.php"; /* （PS：^_^不錯的php學習交流群：276167802，驗證：csl，有興趣的話可以加入進來一起討論） / 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] <div id="main"> <?php /* / Output the comments one by one: */ foreach($comments as $c){ echo $c->markup(); } ?> <div id="addCommentContainer"> <p>Add a Comment</p> <form id="addCommentForm" method="post" action=""> <div> <label for="name">Your Name</label> <input type="text" name="name" id="name" /> <label for="email">Your Email</label> <input type="text" name="email" id="email" /> <label for="url">Website (not required)</label> <input type="text" name="url" id="url" /> <label for="body">Comment Body</label> <textarea name="body" id="body" cols="20" rows="5"></textarea> <input type="submit" id="submit" value="Submit" /> </div> </form> </div> </div> submit.php 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] <?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 $link_open = '<a href="'.$d['url'].'">'; $link_close = '</a>'; } // Converting the time to a UNIX timestamp: $d['dt'] = strtotime($d['dt']); // Needed for the default gravatar image: $url = 'http://'.dirname($_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]).'/img/default_avatar.gif'; return ' <div class="comment"> <div class="avatar"> '.$link_open.' <img src="" /> '.$link_close.' </div> <div class="name">'.$link_open.$d['name'].$link_close.'</div> <div class="date" title="Added at '.date('H:i \o\n d M Y',$d['dt']).'">'.date('d M Y',$d['dt']).'</div> <p>'.$d['body'].'</p> </div> '; } public static function validate(&$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 <br> tags: $str = nl2br(htmlspecialchars($str)); // Remove the new line characters that are left $str = str_replace(array(chr(10),chr(13)),'',$str); return $str; } } ?> 以上是本文關於ajax評論的完整代碼，希望本文對廣大php開發人員有所協助，感謝閱讀本文。
