基于PHP的无刷新添加留言的Ajax实例源码.zip

<?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="http://www.gravatar.com/avatar/'.md5($d['email']).'?size=50&amp;default='.urlencode($url).'" /> '.$link_close.' </div> <div class="name">'.$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; } } ?>