浅析php中session和cookie的区别和联系

function isValidEmail($email) { 

    $email = strtolower($email);
    if (!preg_match(“/[^@]{1,64}@[^@]{1,255}/”, $email)) { 
        return false; 
    } 
    $email_array = explode(“@”, $email); 
    $local_array = explode(“.”, $email_array[0]); 
    $length = sizeof($local_array); 
    for ($i = 0; $i < $length; $i++) { 
        if (!preg_match(“@^[a-z0-9_~-][a-z0-9_~.-]{0,63}$@”, $local_array[$i])) { 
            return false; 
        } 
    } 
    unset($length); 
    if (!preg_match(“@^[?[0-9.]+]?$@”, $email_array[1])) { 

        $domain_array = explode(“.”, $email_array[1]); 

        $length = sizeof($domain_array); 
        if ($length < 2) { 
            return false; 
        } 
        for ($i = 0; $i < $length; $i++) { 
            if (!preg_match(“/^(([a-z0-9][a-z0-9-]{0,61}[a-z0-9])|([a-z0-9]+))$/”, $domain_array[$i])) { 
                return false; 
            } 
        } 
    unset($length); 
    } 
    return true; 
}

function isValidCellPhone($cellPhone) { 

    $flag = FALSE; 

    if (preg_match(‘@^1[3458][0-9]{9}$@’, $cellPhone)) { 

        $flag = TRUE; 

    } 

    return $flag; 

} 

function isValidPhone($phone) { 

    if (preg_match(‘@^1[3458][0-9]{9}$@’, $phone)) { 

        return true; 

    } 

    if (preg_match(‘@((?:(?:(?:00860?|0)(?:10|2d|[3-9]dd))-?)?([2-8]d{6,7}))@’, $phone)){ 

        return true; 

    } 

    if (preg_match(‘@^([48]00(?:d{7}|-d{7}|-d{3}-d{4}|-d{4}-d{3}|d-d{3}-d{3}))$@’, $phone)) { 

        return true; 

    } 

    return false; 

}

function getRealIpAddr()
{
  if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
  {
    $ip=$_SERVER['HTTP_CLIENT_IP'];
  }
  elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
  //to check ip is pass from proxy
  {
    $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
  }
  else
  {
    $ip=$_SERVER['REMOTE_ADDR'];
  }
  return $ip;
}

function real_ip() {
 static $realip = NULL;

 if ($realip !== NULL)  {
  return $realip;
 }

 if (isset($_SERVER)) {
  if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
   $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

   /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
   foreach ($arr AS $ip) {
    $ip = trim($ip);

    if ($ip != 'unknown') {
     $realip = $ip;
     break;
    }
   }
  } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
   $realip = $_SERVER['HTTP_CLIENT_IP'];
  } else {
   if (isset($_SERVER['REMOTE_ADDR'])) {
    $realip = $_SERVER['REMOTE_ADDR'];
   } else {
    $realip = '0.0.0.0';
   }
  }
 } else {
  if (getenv('HTTP_X_FORWARDED_FOR')) {
   $realip = getenv('HTTP_X_FORWARDED_FOR');
  } elseif (getenv('HTTP_CLIENT_IP')) {
   $realip = getenv('HTTP_CLIENT_IP');
  } else {
   $realip = getenv('REMOTE_ADDR');
  }
 }

 preg_match("/[d.]{7,15}/", $realip, $onlineip);
 $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

 return $realip;
}

<?php
function fileRename($dir,$srcExtension,$desExtension){
 if(!is_dir($dir)){
  echo "{$dir}不是一个有效的目录!n";
  exit();  
  }
 $handler = opendir($dir);
 //列出$dir目录中的所有文件
 while(($fileName = readdir($handler))!=false){
  if($fileName!='.'&&$fileName!='..'){
   //'.' 和 '..'是分别指向当前目录和上级目录
   $curDir = $dir.'/'.$fileName;
   if(is_dir($curDir)){
    //如果是目录，则递归下去
    fileRename($curDir,$srcExtension,$desExtension);
    }
    else{
     //获取文件路径的信息
     $path = pathinfo($curDir);
     //print_r($path);
     if($path['extension']==$srcExtension){  
      $newname = $path['dirname'].'/'
      .$path['filename'].".".$desExtension;
      rename($curDir,$newname);   
      echo $curDir.'-->'.$newname."n";   
      }
     }
   }
  }
 }
fileRename(".","JPG","jpg");
?>