php文件上传实例（带文件类型限制）

<form action="up.php" method="post" enctype="multipart/form-data">
<input type="file" name="upload_file" />
<input type="submit" value="上传" />

<?php
$foo = 'hello world!';
$foo = ucwords($foo); // Hello World!

$bar = 'HELLO WORLD!';
$bar = ucwords($bar); // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
?>

<?php
$foo = 'hello world!';
$foo = ucfirst($foo); // Hello world!

$bar = 'HELLO WORLD!';
$bar = ucfirst($bar); // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>

<?php
$foo = 'HelloWorld';
$foo = lcfirst($foo); // helloWorld

$bar = 'HELLO WORLD!';

<?php
$idCard  = '12345678901234567';//身份证号码前17位
$wi = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
$ai = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
$sigma = null;
for ($i = 0; $i < 17; $i++) {
 $sigma += ((int) $idCard{$i}) * $wi[$i];
}
echo "身份证号码：".$idCard.$ai[($sigma % 11)];
?>

function validation_filter_id_card($id_card)
{
if(strlen($id_card) == 18)
{
return idcard_checksum18($id_card);
}
elseif((strlen($id_card) == 15))
{
$id_card = idcard_15to18($id_card);
return idcard_checksum18($id_card);
}
else
{
return false;
}
}
// 计算身份证校验码，根据国家标准GB 11643-1999
function idcard_verify_number($idcard_base)
{
if(strlen($idcard_base) != 17)
{
return false;
}
//加权因子
$factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
//校验码对应值
$verify_number_list = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
$checksum = 0;
for ($i = 0; $i < strlen($idcard_base); $i++)
{
$checksum += substr($idcard_base, $i, 1) * $factor[$i];
}
$mod = $checksum % 11;
$verify_number = $verify_number_list[$mod];
return $verify_number;
}
// 将15位身份证升级到18位
function idcard_15to18($idcard){
if (strlen($idcard) != 15){
return false;
}else{
// 如果身份证顺序码是996 997 998 999，这些是为百岁以上老人的特殊编码
if (array_search(substr($idcard, 12, 3), array('996', '997', '998', '999')) !== false){
$idcard = substr($idcard, 0, 6) . '18'. substr($idcard, 6, 9);
}else{
$idcard = substr($idcard, 0, 6) . '19'. substr($idcard, 6, 9);
}
}
$idcard = $idcard . idcard_verify_number($idcard);
return $idcard;
}
// 18位身份证校验码有效性检查
function idcard_checksum18($idcard){
if (strlen($idcard) != 18){ return false; }
$idcard_base = substr($idcard, 0, 17);
if (idcard_verify_number($idcard_base) != strtoupper(substr($idcard, 17, 1))){
return false;
}else{
return true;
}
}

CREATE TABLE IF NOT EXISTS `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(30) NOT NULL COMMENT '用户名',
  `password` varchar(32) NOT NULL COMMENT '密码',
  `email` varchar(30) NOT NULL COMMENT '邮箱',
  `token` varchar(50) NOT NULL COMMENT '帐号激活码',
  `token_exptime` int(10) NOT NULL COMMENT '激活码有效期',
  `status` tinyint(1) NOT NULL DEFAULT '0' COMMENT '状态,0-未激活,1-已激活',
  `regtime` int(10) NOT NULL COMMENT '注册时间',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;

<form id="reg" action="register.php" method="post">
    <p>用户名：<input type="text" class="input" name="username" id="user"></p>
    <p>密 码：<input type="password" class="input" name="password" id="pass"></p>
    <p>E-mail：<input type="text" class="input" name="email" id="email"></p>
    <p><input type="submit" class="btn" value="提交注册"></p>
</form>

include_once("connect.php");//连接数据库
include_once("smtp.class.php");//邮件发送类

然后我们要过滤用户提交的信息，并验证用户名是否存在（前端也可以验证）。

$username = stripslashes(trim($_POST['username']));
$query = mysql_query("select id from t_user where username='$username'");
$num = mysql_num_rows($query);
if($num==1){
    echo '用户名已存在，请换个其他的用户名';
    exit;
}

$password = md5(trim($_POST['password'])); //加密密码
$email = trim($_POST['email']); //邮箱
$regtime = time();
 
$token = md5($username.$password.$regtime); //创建用于激活识别码
$token_exptime = time()+60*60*24;//过期时间为24小时后
 
$sql = "insert into `t_user` (`username`,`password`,`email`,`token`,`token_exptime`,`regtime`) 
values ('$username','$password','$email','$token','$token_exptime','$regtime')";
 
mysql_query($sql);

if(mysql_insert_id()){
    $smtpserver = ""; //SMTP服务器，如：smtp.163.com
    $smtpserverport = 25; //SMTP服务器端口，一般为25
    $smtpusermail = ""; //SMTP服务器的用户邮箱，如xxx@163.com
    $smtpuser = ""; //SMTP服务器的用户帐号xxx@163.com
    $smtppass = ""; //SMTP服务器的用户密码
    $smtp = new Smtp($smtpserver, $smtpserverport, true, $smtpuser, $smtppass); //实例化邮件类
    $emailtype = "HTML"; //信件类型，文本:text；网页：HTML
    $smtpemailto = $email; //接收邮件方，本例为注册用户的Email
    $smtpemailfrom = $smtpusermail; //发送邮件方，如xxx@163.com
    $emailsubject = "用户帐号激活";//邮件标题
    //邮件主体内容
    $emailbody = "亲爱的".$username."：<br/>感谢您在我站注册了新帐号。<br/>请点击链接激活您的帐号。<br/>
    <a href='/demo/register/active.php?verify=".$token."' target=
'_blank'>/demo/register/active.php?verify=".$token."</a><br/>
    如果以上链接无法点击，请将它复制到你的浏览器地址栏中进入访问，该链接24小时内有效。";
    //发送邮件
    $rs = $smtp->sendmail($smtpemailto, $smtpemailfrom, $emailsubject, $emailbody, $emailtype);
    if($rs==1){
        $msg = '恭喜您，注册成功！<br/>请登录到您的邮箱及时激活您的帐号！';    
    }else{
        $msg = $rs;    
    }
}
echo $msg;

include_once("connect.php");//连接数据库
 
$verify = stripslashes(trim($_GET['verify']));
$nowtime = time();
 
$query = mysql_query("select id,token_exptime from t_user where status='0' and 
`token`='$verify'");
$row = mysql_fetch_array($query);
if($row){
    if($nowtime>$row['token_exptime']){ //24hour
        $msg = '您的激活有效期已过，请登录您的帐号重新发送激活邮件.';
    }else{
        mysql_query("update t_user set status=1 where id=".$row['id']);
        if(mysql_affected_rows($link)!=1) die(0);
        $msg = '激活成功！';
    }
}else{
    $msg = 'error.';    
}
echo $msg;

<?php

class Smtp{

    /* Public Variables */

 var $smtp_port;

 var $time_out;

 var $host_name;

 var $log_file;

 var $relay_host;

 var $debug;

 var $auth;

 var $user;

 var $pass;

 /* Private Variables */
 var $sock;

 /* Constractor */

 function smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass) {
  $this->debug = false;

  $this->smtp_port = $smtp_port;

  $this->relay_host = $relay_host;

  $this->time_out = 30; //is used in fsockopen()

  $this->auth = $auth; //auth

  $this->user = $user;

  $this->pass = $pass;

  $this->host_name = "localhost"; //is used in HELO command
  $this->log_file = "";

  $this->sock = false;
 }

 /* Main Function */

 function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {
  $mail_from = $this->get_address($this->strip_comment($from));

  $body = ereg_replace("(^|(rn))(.)", "1.3", $body);

  $header .= "MIME-Version:1.0rn";

  if ($mailtype == "HTML") {
   $header .= "Content-Type:text/htmlrn";
  }

  $header .= "To: " . $to . "rn";

  if ($cc != "") {
   $header .= "Cc: " . $cc . "rn";
  }

  $header .= "From: $from<" . $from . ">rn";

  $header .= "Subject: " . $subject . "rn";

  $header .= $additional_headers;

  $header .= "Date: " . date("r") . "rn";

  $header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")rn";

  list ($msec, $sec) = explode(" ", microtime());

  $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">rn";

  $TO = explode(",", $this->strip_comment($to));

  if ($cc != "") {
   $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
  }

  if ($bcc != "") {
   $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
  }

  $sent = true;

  foreach ($TO as $rcpt_to) {
   $rcpt_to = $this->get_address($rcpt_to);

   if (!$this->smtp_sockopen($rcpt_to)) {
    $this->log_write("Error: Cannot send email to " . $rcpt_to . "n");

    $sent = false;

    continue;
   }

   if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
    $this->log_write("E-mail has been sent to <" . $rcpt_to . ">n");
   } else {
    $this->log_write("Error: Cannot send email to <" . $rcpt_to . ">n");

    $sent = false;
   }

   fclose($this->sock);

   $this->log_write("Disconnected from remote hostn");
  }

  return $sent;
 }

 /* Private Functions */

 function smtp_send($helo, $from, $to, $header, $body = "") {
  if (!$this->smtp_putcmd("HELO", $helo)) {
   return $this->smtp_error("sending HELO command");
  }
  // auth
  if ($this->auth) {
   if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
    return $this->smtp_error("sending HELO command");
   }

   if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
    return $this->smtp_error("sending HELO command");
   }
  }

  if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
   return $this->smtp_error("sending MAIL FROM command");
  }

  if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
   return $this->smtp_error("sending RCPT TO command");
  }

  if (!$this->smtp_putcmd("DATA")) {
   return $this->smtp_error("sending DATA command");
  }

  if (!$this->smtp_message($header, $body)) {
   return $this->smtp_error("sending message");
  }

  if (!$this->smtp_eom()) {
   return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
  }

  if (!$this->smtp_putcmd("QUIT")) {
   return $this->smtp_error("sending QUIT command");
  }

  return true;
 }

 function smtp_sockopen($address) {
  if ($this->relay_host == "") {
   return $this->smtp_sockopen_mx($address);
  } else {
   return $this->smtp_sockopen_relay();
  }
 }

 function smtp_sockopen_relay() {
  $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "n");

  $this->sock = @ fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

  if (!($this->sock && $this->smtp_ok())) {
   $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "n");

   $this->log_write("Error: " . $errstr . " (" . $errno . ")n");

   return false;
  }

  $this->log_write("Connected to relay host " . $this->relay_host . "n");

  return true;
  ;
 }

 function smtp_sockopen_mx($address) {
  $domain = ereg_replace("^.+@([^@]+)$", "1", $address);

  if (!@ getmxrr($domain, $MXHOSTS)) {
   $this->log_write("Error: Cannot resolve MX "" . $domain . ""n");

   return false;
  }

  foreach ($MXHOSTS as $host) {
   $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "n");

   $this->sock = @ fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

   if (!($this->sock && $this->smtp_ok())) {
    $this->log_write("Warning: Cannot connect to mx host " . $host . "n");

    $this->log_write("Error: " . $errstr . " (" . $errno . ")n");

    continue;
   }

   $this->log_write("Connected to mx host " . $host . "n");

   return true;
  }

  $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")n");

  return false;
 }

 function smtp_message($header, $body) {
  fputs($this->sock, $header . "rn" . $body);

  $this->smtp_debug("> " . str_replace("rn", "n" . "> ", $header . "n> " . $body . "n> "));

  return true;
 }

 function smtp_eom() {
  fputs($this->sock, "rn.rn");

  $this->smtp_debug(". [EOM]n");

  return $this->smtp_ok();
 }

 function smtp_ok() {
  $response = str_replace("rn", "", fgets($this->sock, 512));

  $this->smtp_debug($response . "n");

  if (!ereg("^[23]", $response)) {
   fputs($this->sock, "QUITrn");

   fgets($this->sock, 512);

   $this->log_write("Error: Remote host returned "" . $response . ""n");

   return false;
  }

  return true;
 }

 function smtp_putcmd($cmd, $arg = "") {
  if ($arg != "") {
   if ($cmd == "")
    $cmd = $arg;

   else
    $cmd = $cmd . " " . $arg;
  }

  fputs($this->sock, $cmd . "rn");

  $this->smtp_debug("> " . $cmd . "n");

  return $this->smtp_ok();
 }

 function smtp_error($string) {
  $this->log_write("Error: Error occurred while " . $string . ".n");

  return false;
 }

 function log_write($message) {
  $this->smtp_debug($message);

  if ($this->log_file == "") {
   return true;
  }

  $message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;

  if (!@ file_exists($this->log_file) || !($fp = @ fopen($this->log_file, "a"))) {
   $this->smtp_debug("Warning: Cannot open log file "" . $this->log_file . ""n");

   return false;
   ;
  }

  flock($fp, LOCK_EX);

  fputs($fp, $message);

  fclose($fp);

  return true;
 }

 function strip_comment($address) {
  $comment = "([^()]*)";

  while (ereg($comment, $address)) {
   $address = ereg_replace($comment, "", $address);
  }

  return $address;
 }

 function get_address($address) {
  $address = ereg_replace("([ trn])+", "", $address);

  $address = ereg_replace("^.*<(.+)>.*$", "1", $address);

  return $address;
 }

 function smtp_debug($message) {
  if ($this->debug) {
   echo $message . "
   ;";
  }
 }
}
?>

<?php
$host="localhost";
$db_user="";//用户名
$db_pass="";//密码
$db_name="demo";//数据库
$timezone="Asia/Shanghai";

$link=mysql_connect($host,$db_user,$db_pass);
mysql_select_db($db_name,$link);
mysql_query("SET names UTF8");

header("Content-Type: text/html; charset=utf-8");
date_default_timezone_set($timezone); //北京时间
?>

LoadModule deflate_module modules/mod_deflate.so
LoadModule headers_module modules/mod_headers.so

# BEGIN GZIP
#apache开启gzip压缩，前提要装gzip模块哦
<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/text text/html
text/plain text/xml text/css application/x-javascript
application/javascript
</ifmodule>
# END GZIP

#nginx开启gzip压缩，放在location内
gzip on;
gzip_min_length 1000;
gzip_buffers 4 8k;
gzip_http_version 1.1;
gzip_types text/text text/html text/plain text/xml
 text/css application/x-javascript application/javascript;

//米尔军事网采用 gzip压缩网页
//file_get_contents 直接获得的网页是乱码。
header('Content-Type:text/html;charset=utf-8' );
$url = 'http://www.111cn.net';
$file = fopen($url, "rb");  
//只读2字节  如果为(16进制)1f 8b (10进制)31 139则开启了gzip ;
$bin = fread($file, 2); 
fclose($file);  
$strInfo = @unpack("C2chars", $bin);  
$typeCode = intval($strInfo['chars1'].$strInfo['chars2']);  
$isGzip = 0;  
switch ($typeCode)  
{
    case 31139:      
      //网站开启了gzip
        $isGzip = 1;
        break;
    default:  
        $isGzip = 0;
}  
$url = $isGzip ? "compress.zlib://".$url:$url; // 三元表达式
$mierHtml = file_get_contents($url); //获得米尔军事网数据
$mierHtml = iconv("gbk","utf-8",$mierHtml);
echo $mierHtml;

<?php
/*
php 判断url页面是否使用gzip压缩
*/
$ch = curl_init("http://www.111cn.net/");//url不能有转向
curl_setopt($ch,CURLOPT_HTTPHEADER,array('Accept-Encoding: gzip, deflate'));
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$buffer = curl_exec($ch);
$curl_info = curl_getinfo($ch);
curl_close($ch);
$header_size = $curl_info["header_size"];
//头部信息长度
$headers = substr($buffer, 0, $header_size);
//获取头部信息
$body = substr($buffer, $header_size);
//获取网页内容
 
function getEncoding(&$headers){
    $arr=explode("rn",trim($headers));
    array_shift($arr);
    foreach($arr as $header){
        list($k,$v)=explode(':',$header);
        if ('content-encoding'==strtolower($k)){
            return trim($v);
        }
    }
    return false;
}   
 
$encoding=getEncoding($headers);
 
if ($encoding) {
    echo "Using: ".$encoding;
}else{
    echo "None";
}
 
?>