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php培训 > PHP教程 > PHP常用函数汇总
  • PHP常用函数汇总

    发布:php培训  来源:PHP教程  时间: 2016年12月27日

  • 达内php教程频道总结了一些在php应用开发中常用到的函数,这些函数有字符操作,文件操作及其它的一些操作了,分享给大家仅供学习和参考。...

  • 达内php教程频道总结了一些在php应用开发中常用到的函数,这些函数有字符操作,文件操作及其它的一些操作了,分享给大家仅供学习和参考。具体如下:

    <?php
    /**
     * 获取客户端IP
     * @return [string] [description]
     */
    function getClientIp() {
     $ip = NULL;
     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
      $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
      $pos = array_search('unknown',$arr);
      if(false !== $pos) unset($arr[$pos]);
      $ip = trim($arr[0]);
     }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
      $ip = $_SERVER['HTTP_CLIENT_IP'];
     }elseif (isset($_SERVER['REMOTE_ADDR'])) {
      $ip = $_SERVER['REMOTE_ADDR'];
     }
     // IP地址合法验证
     $ip = (false !== ip2long($ip)) ? $ip : '0.0.0.0';
     return $ip;
    }
     
    /**
     * 获取在线IP
     * @return String
     */
    function getOnlineIp($format=0) {
     global $S_GLOBAL;
     if(empty($S_GLOBAL['onlineip'])) {
      if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
       $onlineip = getenv('HTTP_CLIENT_IP');
      } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
       $onlineip = getenv('HTTP_X_FORWARDED_FOR');
      } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
       $onlineip = getenv('REMOTE_ADDR');
      } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
       $onlineip = $_SERVER['REMOTE_ADDR'];
      }
      preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
      $S_GLOBAL['onlineip'] = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
     }
     
     if($format) {
      $ips = explode('.', $S_GLOBAL['onlineip']);
      for($i=0;$i<3;$i++) {
       $ips[$i] = intval($ips[$i]);
      }
      return sprintf('%03d%03d%03d', $ips[0], $ips[1], $ips[2]);
     } else {
      return $S_GLOBAL['onlineip'];
     }
    }
     
     
     
    /**
     * 获取url
     * @return [type] [description]
     */
    function getUrl(){
     $pageURL = 'http';
     if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") {
     $pageURL .= "s";
     }
     $pageURL .= "://";
     if ($_SERVER["SERVER_PORT"] != "80") {
     $pageURL .= $_SERVER["HTTP_HOST"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
     } else {
     $pageURL .= $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"];
     }
     return $pageURL;
    }
     
    /**
     * 获取当前站点的访问路径根目录
     * @return [type] [description]
     */
    function getSiteUrl() {
     $uri = $_SERVER['REQUEST_URI']?$_SERVER['REQUEST_URI']:($_SERVER['PHP_SELF']?$_SERVER['PHP_SELF']:$_SERVER['SCRIPT_NAME']);
     return 'http://'.$_SERVER['HTTP_HOST'].substr($uri, 0, strrpos($uri, '/')+1);
    }
     
     
     
    /**
     * 字符串截取,支持中文和其他编码
     * @param [string] $str  [字符串]
     * @param integer $start [起始位置]
     * @param integer $length [截取长度]
     * @param string $charset [字符串编码]
     * @param boolean $suffix [是否有省略号]
     * @return [type]   [description]
     */
    function msubstr($str, $start=0, $length=15, $charset="utf-8", $suffix=true) {
     if(function_exists("mb_substr")) {
      return mb_substr($str, $start, $length, $charset);
     } elseif(function_exists('iconv_substr')) {
      return iconv_substr($str,$start,$length,$charset);
     }
     $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
     $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
     $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
     $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
     preg_match_all($re[$charset], $str, $match);
     $slice = join("",array_slice($match[0], $start, $length));
     if($suffix) {
      return $slice."…";
     }
     return $slice;
    }
     
    /**
     * php 实现js escape 函数
     * @param [type] $string [description]
     * @param string $encoding [description]
     * @return [type]   [description]
     */
    function escape($string, $encoding = 'UTF-8'){
     $return = null;
     for ($x = 0; $x < mb_strlen($string, $encoding);$x ++)
     {
     $str = mb_substr($string, $x, 1, $encoding);
     if (strlen($str) > 1) { // 多字节字符
      $return .= "%u" . strtoupper(bin2hex(mb_convert_encoding($str, 'UCS-2', $encoding)));
     } else {
      $return .= "%" . strtoupper(bin2hex($str));
     }
     }
     return $return;
    }
    /**
     * php 实现 js unescape函数
     * @param [type] $str [description]
     * @return [type]  [description]
     */
    function unescape($str) {
     $str = rawurldecode($str);
     preg_match_all("/(?:%u.{4})|.{4};|&#\d+;|.+/U",$str,$r);
     $ar = $r[0];
     foreach($ar as $k=>$v) {
      if(substr($v,0,2) == "%u"){
       $ar[$k] = iconv("UCS-2","utf-8//IGNORE",pack("H4",substr($v,-4)));
      } elseif(substr($v,0,3) == "") {
       $ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,3,-1)));
      } elseif(substr($v,0,2) == "&#") {
       echo substr($v,2,-1)."";
       $ar[$k] = iconv("UCS-2","utf-8",pack("n",substr($v,2,-1)));
      }
     }
     return join("",$ar);
    }
     
    /**
     * 数字转人名币
     * @param [type] $num [description]
     * @return [type]  [description]
     */
    function num2rmb ($num) {
     $c1 = "零壹贰叁肆伍陆柒捌玖";
     $c2 = "分角元拾佰仟万拾佰仟亿";
     $num = round($num, 2);
     $num = $num * 100;
     if (strlen($num) > 10) {
      return "oh,sorry,the number is too long!";
     }
     $i = 0;
     $c = "";
     while (1) {
      if ($i == 0) {
       $n = substr($num, strlen($num)-1, 1);
      } else {
       $n = $num % 10;
      }
      $p1 = substr($c1, 3 * $n, 3);
      $p2 = substr($c2, 3 * $i, 3);
      if ($n != '0' || ($n == '0' && ($p2 == '亿' || $p2 == '万' || $p2 == '元'))) {
       $c = $p1 . $p2 . $c;
      } else {
       $c = $p1 . $c;
      }
      $i = $i + 1;
      $num = $num / 10;
      $num = (int)$num;
      if ($num == 0) {
       break;
      }
     }
     $j = 0;
     $slen = strlen($c);
     while ($j < $slen) {
      $m = substr($c, $j, 6);
      if ($m == '零元' || $m == '零万' || $m == '零亿' || $m == '零零') {
       $left = substr($c, 0, $j);
       $right = substr($c, $j + 3);
       $c = $left . $right;
       $j = $j-3;
       $slen = $slen-3;
      }
      $j = $j + 3;
     }
     if (substr($c, strlen($c)-3, 3) == '零') {
      $c = substr($c, 0, strlen($c)-3);
     } // if there is a '0' on the end , chop it out
     return $c . "整";
    }
     
    /**
     * 特殊的字符
     * @param [type] $str [description]
     * @return [type]  [description]
     */
    function makeSemiangle($str) {
     $arr = array(
      '0' => '0', '1' => '1', '2' => '2', '3' => '3', '4' => '4',
      '5' => '5', '6' => '6', '7' => '7', '8' => '8', '9' => '9',
      'A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E',
      'F' => 'F', 'G' => 'G', 'H' => 'H', 'I' => 'I', 'J' => 'J',
      'K' => 'K', 'L' => 'L', 'M' => 'M', 'N' => 'N', 'O' => 'O',
      'P' => 'P', 'Q' => 'Q', 'R' => 'R', 'S' => 'S', 'T' => 'T',
      'U' => 'U', 'V' => 'V', 'W' => 'W', 'X' => 'X', 'Y' => 'Y',
      'Z' => 'Z', 'a' => 'a', 'b' => 'b', 'c' => 'c', 'd' => 'd',
      'e' => 'e', 'f' => 'f', 'g' => 'g', 'h' => 'h', 'i' => 'i',
      'j' => 'j', 'k' => 'k', 'l' => 'l', 'm' => 'm', 'n' => 'n',
      'o' => 'o', 'p' => 'p', 'q' => 'q', 'r' => 'r', 's' => 's',
      't' => 't', 'u' => 'u', 'v' => 'v', 'w' => 'w', 'x' => 'x',
      'y' => 'y', 'z' => 'z',
      '(' => '(', ')' => ')', '〔' => '[', '〕' => ']', '【' => '[',
      '】' => ']', '〖' => '[', '〗' => ']', '{' => '{', '}' => '}', '《' => '<',
      '》' => '>',
      '%' => '%', '+' => '+', '—' => '-', '-' => '-', '~' => '-',
      ':' => ':', '。' => '.', '、' => ',', ',' => '.', '、' => '.',
      ';' => ';', '?' => '?', '!' => '!', '…' => '-', '‖' => '|',
      '”' => '"', '“' => '"', ''' => '`', '‘' => '`', '|' => '|', '〃' => '"',
      ' ' => ' ','.' => '.');
     return strtr($str, $arr);
    }
     
    /**
     * 下载
     * @param [type] $filename [description]
     * @param string $dir  [description]
     * @return [type]   [description]
     */
    function downloads($filename,$dir='./'){
     $filepath = $dir.$filename;
     if (!file_exists($filepath)){
      header("Content-type: text/html; charset=utf-8");
      echo "File not found!";
      exit;
     } else {
      $file = fopen($filepath,"r");
      Header("Content-type: application/octet-stream");
      Header("Accept-Ranges: bytes");
      Header("Accept-Length: ".filesize($filepath));
      Header("Content-Disposition: attachment; filename=".$filename);
      echo fread($file, filesize($filepath));
      fclose($file);
     }
    }
     
    /**
     * 创建一个目录树
     * @param [type] $dir [description]
     * @param integer $mode [description]
     * @return [type]  [description]
     */
    function mkdirs($dir, $mode = 0777) {
     if (!is_dir($dir)) {
      mkdirs(dirname($dir), $mode);
      return mkdir($dir, $mode);
     }
     return true;
    }

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