CodeIgniter创建一个简单的注册系统

CREATE TABLE IF NOT EXISTS `ci_users` ( `id_users` bigint(20) NOT NULL AUTO_INCREMENT, `user_login` varchar(255) NOT NULL, `user_pass` varchar(32) NOT NULL, `user_email` varchar(255) NOT NULL, `first_name` varchar(100) NOT NULL, `last_name` varchar(100) NOT NULL, PRIMARY KEY (`id_users`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

function create_user(){ $first_name = $this->input->post('first_name'); $last_name = $this->input->post('last_name'); $username = $this->input->post('user_login'); $eml = $this->input->post('email_address'); $clear_pass = $this->input->post('password'); $member_data = array( 'user_login' => $username, 'user_pass' => md5($clear_pass), 'user_email' => $eml, 'first_name' => $first_name, 'last_name' => $last_name ); $insert = $this->db->insert('ci_users', $member_data); return $insert; }

PHP
$this->load->library('form_validation');

<?php
// 设置url
$url = 'http://www.111cn.net';
function get_http_status_code($url) {
 if(empty($url)) return false;
 $url = parse_url($url);
 $host = isset($url['host']) ? $url['host'] : '';
 $port = isset($url['port']) ? $url['port'] : '80';
 $path = isset($url['path']) ? $url['path'] : '';
 $query = isset($url['query']) ? $url['query'] : '';

 $request = "HEAD $path?$query HTTP/1.1rn"
           ."Host: $hostrn"
           ."Connection: closern"
           ."rn";

 $address = gethostbyname($host);
 $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
 socket_connect($socket, $address, $port);

 socket_write($socket, $request, strlen($request));

 $response = split(' ', socket_read($socket, 1024));
 socket_close($socket);
 return  trim($response[1]);
}
echo get_http_status_code($url);

<?php
class LCS {
    var $str1;
    var $str2;
    var $c = array();
    /*返回串一和串二的最长公共子序列
*/
    function getLCS($str1, $str2, $len1 = 0, $len2 = 0) {
        $this->str1 = $str1;
        $this->str2 = $str2;
        if ($len1 == 0) $len1 = strlen($str1);
        if ($len2 == 0) $len2 = strlen($str2);
        $this->initC($len1, $len2);
        return $this->printLCS($this->c, $len1 - 1, $len2 - 1);
    }
    /*返回两个串的相似度
*/
    function getSimilar($str1, $str2) {
        $len1 = strlen($str1);
        $len2 = strlen($str2);
        $len = strlen($this->getLCS($str1, $str2, $len1, $len2));
        return $len * 2 / ($len1 + $len2);
    }
    function initC($len1, $len2) {
        for ($i = 0; $i < $len1; $i++) $this->c[$i][0] = 0;
        for ($j = 0; $j < $len2; $j++) $this->c[0][$j] = 0;
        for ($i = 1; $i < $len1; $i++) {
            for ($j = 1; $j < $len2; $j++) {
                if ($this->str1[$i] == $this->str2[$j]) {
                    $this->c[$i][$j] = $this->c[$i - 1][$j - 1] + 1;
                } else if ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {
                    $this->c[$i][$j] = $this->c[$i - 1][$j];
                } else {
                    $this->c[$i][$j] = $this->c[$i][$j - 1];
                }
            }
        }
    }
    function printLCS($c, $i, $j) {
        if ($i == 0 || $j == 0) {
            if ($this->str1[$i] == $this->str2[$j]) return $this->str2[$j];
            else return "";
        }
        if ($this->str1[$i] == $this->str2[$j]) {
            return $this->printLCS($this->c, $i - 1, $j - 1).$this->str2[$j];
        } else if ($this->c[$i - 1][$j] >= $this->c[$i][$j - 1]) {
            return $this->printLCS($this->c, $i - 1, $j);
        } else {
            return $this->printLCS($this->c, $i, $j - 1);
        }
    }
}

$lcs = new LCS();
//返回最长公共子序列
$lcs->getLCS("hello word","hello china");
//返回相似度
echo $lcs->getSimilar("吉林禽业公司火灾已致112人遇难","吉林宝源丰禽业公司火灾已致112人遇难");同样输出结果为：0.90322580645161，明显准确的多。

<?php
 //获取列表
 $url = '/s2005/shishi.shtml';
 $con=file_get_contents($url);
 //写正则获取列表中的文章链接
 /*范例 ： <a test=a href='/20130418/n373177942.shtml'
          target='_blank'>湖南沅陵输电工程沉船事故共致6人死亡</a>*/
 $preg = "|<a test=a href='(.*)' target='_blank'>(.*)</a>|iUs";
 // 正则中的/i表示 大小写不敏感 /U 非贪婪匹配 /s 点号可以匹配换行符
 preg_match_all($preg,$con,$arr);
 //var_dump($arr);
    /*
    array(3) {
  [0]=>
  array(40) {
    [0]=>
    string(126) "<a test=a href='/20130418/n373180618.shtml'
target='_blank'>甘肃河西走廊遭大风沙尘侵袭 瞬时最大风力9级</a>"
    [1]=>
    string(112) "<a test=a href='/20130418/n373180612.shtml'
target='_blank'>一线城市住宅地价全部环比上涨</a>"
    ... ...
    [39]=>
    string(124) "<a test=a href='/20130418/n373161633.shtml'
target='_blank'>湖南衡阳发生一起枪击案致1人死 警方正缉凶</a>"
  }
  [1]=>
  array(40) {
    [0]=>
    string(46) "/20130418/n373180618.shtml"
    [1]=>
    string(46) "/20130418/n373180612.shtml"
    ... ...
    [39]=>
    string(46) "/20130418/n373161633.shtml"
  }
  [2]=>
  array(40) {
    [0]=>
    string(42) "甘肃河西走廊遭大风沙尘侵袭 瞬时最大风力9级"
    [1]=>
    string(28) "一线城市住宅地价全部环比上涨"
    ... ...
    [39]=>
    string(40) "湖南衡阳发生一起枪击案致1人死 警方正缉凶"
  }
}
    */
?>

<?php
$url = 'http://www.111cn.net';
$con = file_get_contents($url);
//正则表达式分为标题和内容
$title_preg = "|<h1>(.*)</h1>|iUs";
$content_preg = "|<!-- 正文 -->(.*)<!-- 分享 -->|iUs";
preg_match($title_preg,$con,$title_arr);
preg_match($content_preg,$con,$content_arr);
?>