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PHP+AJAX实时检查帐号是否被注册代码
时间:2015-08-27 编辑:简简单单 来源:一聚教程网
数据库部分:
CREATE TABLE `username_list` ( `id` int(11) NOT NULL auto_increment, `username` varchar(60) character set latin1 NOT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;
js代码
XML/HTML Code
输入的字符大于等于4才会检测
check_username.php
include_once("conn.php"); //check we have username post var if(isset($_POST["username"])) { //check if its ajax request, exit script if its not if(!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') { die(); } //trim and lowercase username $username = strtolower(trim($_POST["username"])); //sanitize username $username = filter_var($username, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW|FILTER_FLAG_STRIP_HIGH); //check username in db $results = mysql_query("SELECT id FROM username_list WHERE username='$username'"); //return total count $username_exist = mysql_num_rows($results); //total records //if value is more than 0, username is not available if($username_exist) { die(''); }else{ die(''); } //close db connection } ?>
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