常用的php函数

最严格身份证号码验证，支持15位和19世纪出生的人的身份证号码
# 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;
} 

 //循环创建目录  要用/结尾
function create_dirs($path){
   if (!is_dir($path)){
     $directory_path = "";
     $directories = explode("/",$path);
     array_pop($directories);
     foreach($directories as $directory){
       $directory_path .= $directory."/";
       if (!is_dir($directory_path)){
         mkdir($directory_path);
         chmod($directory_path, 0777);
       }
     }
   }
  }

/**
 * 写日志
 * @param string $log   日志信息
 * @param string $type  日志类型 [system|app|...]
 * @param string $level 日志级别
 * @return boolean
 */
function write_log($log, $type = 'default', $level = 'log'){
  date_default_timezone_set('PRC');
  if(!defined('INSTALL_PATH')){
    return;
  }
  $now_time = date('H:i:s');
  $target   = 'log/'.date("Ym").'/' ;
  mk_dir($target);
  if (!path_writeable($target)){
    exit('path can not write!');
  }
  $ext = '.log';
  //.php .log;
  $target .= date('Y_m_d').'_'.$level.$ext;
  //检测日志文件大小, 超过配置大小则重命名
  if (file_exists($target) && get_filesize($target) >= 1024*1024*10) {
    $fileName = substr(basename($target),0,strrpos(basename($target),$ext)).date('H:i:s').$ext;
    $re = rename($target, dirname($target) .'/'. $fileName);
  }
  if(!file_exists($target)){
    error_log("$now_time $type $log\n", 3,$target);
  }

  if(is_object($log) || is_array($log)){
    $log = json_encode_force($log);
  }
  clearstatcache();
  return error_log("$now_time $type $log\n", 3, $target);
}

/**
* 循环删除目录和文件
* @param string $dir_name
* @return bool
*/
function delete_dir_file($dirName)
   {
       $result = false;
       if ($handle = opendir($dirName)) {
           while (false !== ($item = readdir($handle))) {
               if ($item != "." && $item != "..") {
                   if (is_dir("$dirName/$item")) {
                       delete_dir_file("$dirName/$item");
                   } else {
                       //删除文件
                       unlink("$dirName/$item");
                   }
               }
           }
           closedir($handle);
           //删除空文件夹
           if (rmdir($dirName)) {
               $result = true;
           }
           return $result;
       }
   }

/**
 * 判断是否为手机访问
 * @return  boolean
 */
function is_mobile()
{
    static $is_mobile;

    if (isset($is_mobile)) {
        return $is_mobile;
    }

    if (empty($_SERVER['HTTP_USER_AGENT'])) {
        $is_mobile = false;
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'Android') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'Silk/') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'Kindle') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mini') !== false
        || strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mobi') !== false
    ) {
        $is_mobile = true;
    } else {
        $is_mobile = false;
    }

    return $is_mobile;
}

/**
 * 手机号格式检查
 * @param string $mobile
 * @return bool
 */
function check_mobile_number($mobile)
{
    if (!is_numeric($mobile)) {
        return false;
    }
    $reg = '#^13[\d]{9}$|^14[5,7]{1}\d{8}$|^15[^4]{1}\d{8}$|^17[0,6,7,8]{1}\d{8}$|^18[\d]{9}$#';

    return preg_match($reg, $mobile) ? true : false;
}

/**
 * 友好的时间显示
 *
 * @param int    $sTime 待显示的时间
 * @param string $type  类型. normal | mohu | full | ymd | other
 * @param string $alt   已失效
 * @return string
 */
function friendlyDate($sTime,$type = 'normal',$alt = 'false') {
    if (!$sTime)
        return '';
    //sTime=源时间，cTime=当前时间，dTime=时间差
    $cTime      =   time();
    $dTime      =   $cTime - $sTime;
    $dDay       =   intval(date("z",$cTime)) - intval(date("z",$sTime));
    //$dDay     =   intval($dTime/3600/24);
    $dYear      =   intval(date("Y",$cTime)) - intval(date("Y",$sTime));
    //normal：n秒前，n分钟前，n小时前，日期
    if($type=='normal'){
        if( $dTime < 60 ){
            if($dTime < 10){
                return '刚刚';    //by yangjs
            }else{
                return intval(floor($dTime / 10) * 10)."秒前";
            }
        }elseif( $dTime < 3600 ){
            return intval($dTime/60)."分钟前";
        //今天的数据.年份相同.日期相同.
        }elseif( $dYear==0 && $dDay == 0  ){
            //return intval($dTime/3600)."小时前";
            return '今天'.date('H:i',$sTime);
        }elseif($dYear==0){
            return date("m月d日 H:i",$sTime);
        }else{
            return date("Y-m-d H:i",$sTime);
        }
    }elseif($type=='mohu'){
        if( $dTime < 60 ){
            return $dTime."秒前";
        }elseif( $dTime < 3600 ){
            return intval($dTime/60)."分钟前";
        }elseif( $dTime >= 3600 && $dDay == 0  ){
            return intval($dTime/3600)."小时前";
        }elseif( $dDay > 0 && $dDay<=7 ){
            return intval($dDay)."天前";
        }elseif( $dDay > 7 &&  $dDay <= 30 ){
            return intval($dDay/7) . '周前';
        }elseif( $dDay > 30 ){
            return intval($dDay/30) . '个月前';
        }
    //full: Y-m-d , H:i:s
    }elseif($type=='full'){
        return date("Y-m-d , H:i:s",$sTime);
    }elseif($type=='ymd'){
        return date("Y-m-d",$sTime);
    }else{
        if( $dTime < 60 ){
            return $dTime."秒前";
        }elseif( $dTime < 3600 ){
            return intval($dTime/60)."分钟前";
        }elseif( $dTime >= 3600 && $dDay == 0  ){
            return intval($dTime/3600)."小时前";
        }elseif($dYear==0){
            return date("Y-m-d H:i:s",$sTime);
        }else{
            return date("Y-m-d H:i:s",$sTime);
        }
    }
}

/**
 * 二维数组合并
 * @param string $
 * @return
 */
function arr_map($arr)
{
     foreach($arr as $k => $v){
         foreach($v as $k1 => $v2){
             $new_arr[$k1][$k] = $v2;
             }
         }
     return $new_arr;
}

/**
 * 对一个给定的二维数组按照指定的键值进行排序
 * @return array
 */
function array_sort($arr,$keys,$type='asc'){
    $keysvalue = $new_array = array();
    foreach ($arr as $k=>$v){
        $keysvalue[$k] = $v[$keys];
    }
    if($type == 'asc'){
        asort($keysvalue);
    }else{
        arsort($keysvalue);
    }
    reset($keysvalue);
    foreach ($keysvalue as $k=>$v){
        $new_array[$k] = $arr[$k];
    }
    return $new_array;
}

/**
 * 时间日期格式化为多少天前
 * @param sting|intval $date_time
 * @param intval $type 1、'Y-m-d H:i:s' 2、时间戳
 * @return string
 */
function format_datetime($date_time,$type=1,$format=false){
    if($type == 1){
        $timestamp = strtotime($date_time);
    }elseif($type == 2){
        $timestamp = $date_time;
        $date_time = date('Y-m-d H:i:s',$date_time);
    }
    if($format==true){
        return date($format,$timestamp);
    }
    $difference = time()-$timestamp;
    if($difference <= 180){
        return '刚刚';
    }elseif($difference <= 3600){
        return ceil($difference/60).'分钟前';
    }elseif($difference <= 86400){
        return ceil($difference/3600).'小时前';
    }elseif($difference <= 2592000){
        return ceil($difference/86400).'天前';
    }elseif($difference <= 31536000){
        return ceil($difference/2592000).'个月前';
    }else{
        return ceil($difference/31536000).'年前';
        //return $date_time;
    }
}

/*
 * 获取随机字符串
 *
 *@param intval $len 随机长度
 *
 *
 */
function getRandomString($len, $chars=null)
{
    if (is_null($chars)){
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    }
    mt_srand(10000000*(double)microtime());
    for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i++){
        $str .= $chars[mt_rand(0, $lc)];
    }
    return $str;
}

/**
 * 获取文件列表(所有子目录文件)
 *
 * @param string $path 目录
 * @param array $file_list 存放所有子文件的数组
 * @param array $ignore_dir 需要忽略的目录或文件
 * @return array 数据格式的返回结果
 */
function read_file_list($path, &$file_list, $ignore_dir = array())
{
    $path = rtrim($path, '/');
    if (is_dir($path)) {
        $handle = @opendir($path);
        if ($handle) {
            while (false !== ($dir = readdir($handle))) {
                if ($dir != '.' && $dir != '..') {
                    if (!in_array($dir, $ignore_dir)) {
                        if (is_file($path . '/' . $dir)) {
                            $file_list[] = $path . '/' . $dir;
                        }
                        elseif (is_dir($path . '/' . $dir)) {
                            read_file_list($path . '/' . $dir, $file_list, $ignore_dir);
                        }
                    }
                }
            }
            @closedir($handle);
        }
        else {
            return false;
        }
    }
    else {
        return false;
    }
}

/**
 * 字符串切割函数，一个字母算一个位置,一个字算2个位置
 *
 * @param string $string 待切割的字符串
 * @param int $length 切割长度
 * @param string $dot 尾缀
 */
function str_cut($string, $length, $dot = '')
{
    $string = str_replace(array(
                              ' ', '&', '"', ''', '“', '”', '—', '<', '>',
                              '·', '…'
                          ), array(' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);
    $strlen = strlen($string);
    if ($strlen <= $length)
        return $string;
    $maxi = $length - strlen($dot);
    $strcut = '';

    $n = $tn = $noc = 0;
    while ($n < $strlen) {
        $t = ord($string[$n]);
        if ($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
            $tn = 1;
            $n++;
            $noc++;
        }
        elseif (194 <= $t && $t <= 223) {
            $tn = 2;
            $n += 2;
            $noc += 2;
        }
        elseif (224 <= $t && $t < 239) {
            $tn = 3;
            $n += 3;
            $noc += 2;
        }
        elseif (240 <= $t && $t <= 247) {
            $tn = 4;
            $n += 4;
            $noc += 2;
        }
        elseif (248 <= $t && $t <= 251) {
            $tn = 5;
            $n += 5;
            $noc += 2;
        }
        elseif ($t == 252 || $t == 253) {
            $tn = 6;
            $n += 6;
            $noc += 2;
        }
        else {
            $n++;
        }
        if ($noc >= $maxi)
            break;
    }
    if ($noc > $maxi)
        $n -= $tn;
    $strcut = substr($string, 0, $n);
    $strcut = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', ''', '&lt;', '&gt;'), $strcut);
    return $strcut . $dot;
}

/**
 * 取得随机数
 *
 * @param int $length 生成随机数的长度
 * @param int $numeric 是否只产生数字随机数 1是0否
 * @return string
 */
function random($length, $numeric = 0)
{
    $seed = base_convert(md5(microtime() . $_SERVER['DOCUMENT_ROOT']), 16, $numeric ? 10 : 35);
    $seed = $numeric ? (str_replace('0', '', $seed) . '012340567890') : ($seed . 'zZ' . strtoupper($seed));
    $hash = '';
    $max = strlen($seed) - 1;
    for ($i = 0; $i < $length; $i++) {
        $hash .= $seed{mt_rand(0, $max)};
    }
    return $hash;
}

/**
 * 将字符部分加密并输出
 * @param unknown $str
 * @param unknown $start 从第几个位置开始加密(从1开始)
 * @param unknown $length 连续加密多少位
 * @return string
 */
function encrypt_show($str, $start, $length)
{
    $end = $start - 1 + $length;
    $array = str_split($str);
    foreach ($array as $k => $v) {
        if ($k >= $start - 1 && $k < $end) {
            $array[$k] = '*';
        }
    }
    return implode('', $array);
}

/**
 * CURL请求
 * @param $url 请求url地址
 * @param $method 请求方法 get post
 * @param null $postfields post数据数组
 * @param array $headers 请求header信息
 * @param bool|false $debug 调试开启 默认false
 * @return mixed
 */
function http_request($url, $method = "GET", $postfields = null, $headers = array(), $debug = false)
{
    $method = strtoupper($method);
    $ci = curl_init();
    /* Curl settings */
    curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
    curl_setopt($ci, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0");
    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 60); /* 在发起连接前等待的时间，如果设置为0，则无限等待 */
    curl_setopt($ci, CURLOPT_TIMEOUT, 7); /* 设置cURL允许执行的最长秒数 */
    curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);
    switch ($method) {
        case "POST":
            curl_setopt($ci, CURLOPT_POST, true);
            if (!empty($postfields)) {
                $tmpdatastr = is_array($postfields) ? http_build_query($postfields) : $postfields;
                curl_setopt($ci, CURLOPT_POSTFIELDS, $tmpdatastr);
            }
            break;
        default:
            curl_setopt($ci, CURLOPT_CUSTOMREQUEST, $method); /* //设置请求方式 */
            break;
    }
    $ssl = preg_match('/^https:\/\//i', $url) ? TRUE : FALSE;
    curl_setopt($ci, CURLOPT_URL, $url);
    if ($ssl) {
        curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求 不验证证书和hosts
        curl_setopt($ci, CURLOPT_SSL_VERIFYHOST, FALSE); // 不从证书中检查SSL加密算法是否存在
    }
    //curl_setopt($ci, CURLOPT_HEADER, true); /*启用时会将头文件的信息作为数据流输出*/
    curl_setopt($ci, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ci, CURLOPT_MAXREDIRS, 2);/*指定最多的HTTP重定向的数量，这个选项是和CURLOPT_FOLLOWLOCATION一起使用的*/
    curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ci, CURLINFO_HEADER_OUT, true);
    /*curl_setopt($ci, CURLOPT_COOKIE, $Cookiestr); * *COOKIE带过去** */
    $response = curl_exec($ci);
    $requestinfo = curl_getinfo($ci);
    $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);
    if ($debug) {
        echo "=====post data======\r\n";
        var_dump($postfields);
        echo "=====info===== \r\n";
        print_r($requestinfo);
        echo "=====response=====\r\n";
        print_r($response);
    }
    curl_close($ci);
    return $response;
}