Sharing of commonly used PHP operation functions

1. PHP encryption and decryption

PHP encryption and decryption functions can be used to encrypt some useful strings and store them in the database, and through reversible decryption of the strings, the The function uses base64 and MD5 encryption and decryption.

function encryptDecrypt($key, $string, $decrypt){
    if($decrypt){
        $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");
        return $decrypted;
    }else{
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));
        return $encrypted;
    }
}

The usage method is as follows:

//以下是将字符串“Helloweba欢迎您”分别加密和解密 //加密： echo encryptDecrypt('password', 'Helloweba欢迎您',0);
//解密： echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=',1);

2. PHP generates random strings

When we need to generate a random name, temporary password and other strings, we can use the following Function:

function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
    return $randomString;
}

The usage method is as follows:

echo generateRandomString(20);

3. PHP gets the file extension (suffix)

The following function can quickly get the file extension, that is, the suffix.

function getExtension($filename){
  $myext = substr($filename, strrpos($filename, '.'));
  return str_replace('.','',$myext);
}

The usage method is as follows:

$filename = '我的文档.doc';
echo getExtension($filename);

4. PHP gets the file size and formats it

The function used below can get the file size and convert it into KB that is easy to read. , MB and other formats.

function formatSize($size) {
    $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
    if ($size == 0) {
        return('n/a');
    } else {
      return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);
    }
}

The usage method is as follows:

$thefile = filesize('test_file.mp3');
echo formatSize($thefile);

5. PHP replace tag characters

Sometimes we need to replace strings and template tags with specified content, you can use the following Function:

function stringParser($string,$replacer){
    $result = str_replace(array_keys($replacer), array_values($replacer),$string);
    return $result;
}

The usage is as follows:

$string = 'The {b}anchor text{/b} is the {b}actual word{/b} or words used {br}to describe the link {br}itself';
$replace_array = array(&#39;{b}&#39; => &#39;<b>&#39;,&#39;{/b}&#39; => &#39;</b>&#39;,&#39;{br}&#39; => &#39;<br />&#39;);

echo stringParser($string,$replace_array);

6. PHP lists the file names in the directory

If you want to list all the files in the directory, use the following code That’s it:

function listDirFiles($DirPath){
    if($dir = opendir($DirPath)){
         while(($file = readdir($dir))!== false){
                if(!is_dir($DirPath.$file))
                {
                    echo "filename: $file<br />";
                }
         }
    }
}

The usage is as follows:

listDirFiles('home/some_folder/');

7. PHP gets the URL of the current page

The following function can get the URL of the current page, whether it is http or https:

function curPageURL() {
    $pageURL = 'http';
    if (!empty($_SERVER['HTTPS'])) {$pageURL .= "s";}
    $pageURL .= "://";
    if ($_SERVER["SERVER_PORT"] != "80") {
        $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
    } else {
        $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
    }
    return $pageURL;
}

The usage method is as follows:

echo curPageURL();

8. PHP forced download of files

Sometimes we don’t want the browser to directly open files, such as PDF files, but to download files directly, Then the following function can force the file to be downloaded. The application/octet-stream header type is used in the function.

function download($filename){
    if ((isset($filename))&&(file_exists($filename))){
       header("Content-length: ".filesize($filename));
       header('Content-Type: application/octet-stream');
       header('Content-Disposition: attachment; filename="' . $filename . '"');
       readfile("$filename");
    } else {
       echo "Looks like file does not exist!";
    }
}

The usage method is as follows:

download('/down/test_45f73e852.zip');

9. PHP intercepts the string length

We often encounter situations where we need to intercept the length of a string (including Chinese characters), such as The title cannot exceed how many characters. The excess length is represented by.... The following function can meet your needs.

/*
 Utf-8、gb2312都支持的汉字截取函数
 cut_str(字符串, 截取长度, 开始长度, 编码);
 编码默认为 utf-8
 开始长度默认为 0 */ function cutStr($string, $sublen, $start = 0, $code = 'UTF-8'){
    if($code == 'UTF-8'){
        $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
        preg_match_all($pa, $string, $t_string);

        if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
        return join('', array_slice($t_string[0], $start, $sublen));
    }else{
        $start = $start*2;
        $sublen = $sublen*2;
        $strlen = strlen($string);
        $tmpstr = '';

        for($i=0; $i<$strlen; $i++){
            if($i>=$start && $i<($start+$sublen)){
                if(ord(substr($string, $i, 1))>129){
                    $tmpstr.= substr($string, $i, 2);
                }else{
                    $tmpstr.= substr($string, $i, 1);
                }
            }
            if(ord(substr($string, $i, 1))>129) $i++;
        }
        if(strlen($tmpstr)<$strlen ) $tmpstr.= "...";
        return $tmpstr;
    }
}

The usage method is as follows:

$str = "jQuery插件实现的加载图片和页面效果";
echo cutStr($str,16);

10. PHP gets the real IP of the client

We often use the database to record the user’s IP. The following code can get the real IP of the client. IP:

//获取用户真实IP function getIp() {
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
        $ip = getenv("HTTP_CLIENT_IP");
    else
        if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
            $ip = getenv("HTTP_X_FORWARDED_FOR");
        else
            if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
                $ip = getenv("REMOTE_ADDR");
            else
                if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
                    $ip = $_SERVER['REMOTE_ADDR'];
                else
                    $ip = "unknown";
    return ($ip);
}

The usage method is as follows:

echo getIp();

11. PHP prevents SQL injection

When we query the database, for security reasons, we need to filter some illegal characters to prevent SQL For malicious injection, please take a look at the function:

function injCheck($sql_str) {
    $check = preg_match('/select|insert|update|delete|'|/*|*|../|./|union|into|load_file|outfile/', $sql_str);
    if ($check) {
        echo '非法字符！！';
        exit;
    } else {
        return $sql_str;
    }
}

The usage method is as follows:

echo injCheck('1 or 1=1');

12. PHP page prompts and jumps

When we perform form operations, sometimes in order to be friendly If you need to prompt the user for the operation result and jump to the relevant page, please see the following function:

function message($msgTitle,$message,$jumpUrl){
    $str = &#39;<!DOCTYPE HTML>&#39;;
    $str .= &#39;<html>&#39;;
    $str .= &#39;<head>&#39;;
    $str .= &#39;<meta charset="utf-8">&#39;;
    $str .= &#39;<title>页面提示</title>&#39;;
    $str .= &#39;<style type="text/css">&#39;;
    $str .= &#39;*{margin:0; padding:0}a{color:#369; text-decoration:none;}a:hover{text-decoration:underline}body{height:100%; font:12px/18px Tahoma, Arial,  sans-serif; color:#424242; background:#fff}.message{width:450px; height:120px; margin:16% auto; border:1px solid #99b1c4; background:#ecf7fb}.message h3{height:28px; line-height:28px; background:#2c91c6; text-align:center; color:#fff; font-size:14px}.msg_txt{padding:10px; margin-top:8px}.msg_txt h4{line-height:26px; font-size:14px}.msg_txt h4.red{color:#f30}.msg_txt p{line-height:22px}&#39;;
    $str .= &#39;</style>&#39;;
    $str .= &#39;</head>&#39;;
    $str .= &#39;<body>&#39;;
    $str .= &#39;<p class="message">&#39;;
    $str .= &#39;<h3>&#39;.$msgTitle.&#39;</h3>&#39;;
    $str .= &#39;<p class="msg_txt">&#39;;
    $str .= &#39;<h4 class="red">&#39;.$message.&#39;</h4>&#39;;
    $str .= &#39;<p>系统将在 <span style="color:blue;font-weight:bold">3</span> 秒后自动跳转,如果不想等待,直接点击 <a href="{$jumpUrl}">这里</a> 跳转</p>&#39;;
    $str .= "<script>setTimeout(&#39;location.replace(&#39;".$jumpUrl."&#39;)&#39;,2000)</script>";
    $str .= &#39;</p>&#39;;
    $str .= &#39;</p>&#39;;
    $str .= &#39;</body>&#39;;
    $str .= &#39;</html>&#39;;
    echo $str;
}

The usage is as follows:

message('操作提示','操作成功！','https://segmentfault.com/');

13. PHP calculation time

We are processing it time, it is necessary to calculate the length of time from the current time to a certain point in time. For example, to calculate the running time of the client, hh:mm:ss is usually used to represent

function changeTimeType($seconds) {
    if ($seconds > 3600) {
        $hours = intval($seconds / 3600);
        $minutes = $seconds % 3600;
        $time = $hours . ":" . gmstrftime('%M:%S', $minutes);
    } else {
        $time = gmstrftime('%H:%M:%S', $seconds);
    }
    return $time;
}

The usage method is as follows:

$seconds = 3712;
echo changeTimeType($seconds);

The following is Obtain client IP, string interception, download, etc. For details, please view the following code:

<?php/**
 * 获取客户端IP
 * @return [string] [description]
 */function getClientIp() {
 $ip = NULL; if (isset($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])) {  $arr = explode(&#39;,&#39;, $_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]);  $pos = array_search(&#39;unknown&#39;,$arr);  if(false !== $pos) unset($arr[$pos]);  $ip = trim($arr[0]);
 }elseif (isset($_SERVER[&#39;HTTP_CLIENT_IP&#39;])) {  $ip = $_SERVER[&#39;HTTP_CLIENT_IP&#39;];
 }elseif (isset($_SERVER[&#39;REMOTE_ADDR&#39;])) {  $ip = $_SERVER[&#39;REMOTE_ADDR&#39;];
 } // IP地址合法验证
 $ip = (false !== ip2long($ip)) ? $ip : &#39;0.0.0.0&#39;; return $ip;
}/**
 * 获取在线IP
 * @return String
 */function getOnlineIp($format=0) {
 global $S_GLOBAL; if(empty($S_GLOBAL[&#39;onlineip&#39;])) {  if(getenv(&#39;HTTP_CLIENT_IP&#39;) && strcasecmp(getenv(&#39;HTTP_CLIENT_IP&#39;), &#39;unknown&#39;)) {   $onlineip = getenv(&#39;HTTP_CLIENT_IP&#39;);
  } elseif(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;) && strcasecmp(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;), &#39;unknown&#39;)) {   $onlineip = getenv(&#39;HTTP_X_FORWARDED_FOR&#39;);
  } elseif(getenv(&#39;REMOTE_ADDR&#39;) && strcasecmp(getenv(&#39;REMOTE_ADDR&#39;), &#39;unknown&#39;)) {   $onlineip = getenv(&#39;REMOTE_ADDR&#39;);
  } elseif(isset($_SERVER[&#39;REMOTE_ADDR&#39;]) && $_SERVER[&#39;REMOTE_ADDR&#39;] && strcasecmp($_SERVER[&#39;REMOTE_ADDR&#39;], &#39;unknown&#39;)) {   $onlineip = $_SERVER[&#39;REMOTE_ADDR&#39;];
  }
  preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);  $S_GLOBAL[&#39;onlineip&#39;] = $onlineipmatches[0] ? $onlineipmatches[0] : &#39;unknown&#39;;
 } if($format) {  $ips = explode(&#39;.&#39;, $S_GLOBAL[&#39;onlineip&#39;]);  for($i=0;$i<3;$i++) {   $ips[$i] = intval($ips[$i]);
  }  return sprintf(&#39;%03d%03d%03d&#39;, $ips[0], $ips[1], $ips[2]);
 } else {  return $S_GLOBAL[&#39;onlineip&#39;];
 }
}/**
 * 获取url
 * @return [type] [description]
 */function getUrl(){
 $pageURL = &#39;http&#39;; if (isset($_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 = $_SERVER[&#39;REQUEST_URI&#39;]?$_SERVER[&#39;REQUEST_URI&#39;]:($_SERVER[&#39;PHP_SELF&#39;]?$_SERVER[&#39;PHP_SELF&#39;]:$_SERVER[&#39;SCRIPT_NAME&#39;]); return &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].substr($uri, 0, strrpos($uri, &#39;/&#39;)+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, $charset);
 } elseif(function_exists(&#39;iconv_substr&#39;)) {  return iconv_substr($str,$start,$length,$charset);
 } $re[&#39;utf-8&#39;] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/"; $re[&#39;gb2312&#39;] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/"; $re[&#39;gbk&#39;] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/"; $re[&#39;big5&#39;] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
 preg_match_all($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 = &#39;UTF-8&#39;){
 $return = null; for ($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, &#39;UCS-2&#39;, $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 != &#39;0&#39; || ($n == &#39;0&#39; && ($p2 == &#39;亿&#39; || $p2 == &#39;万&#39; || $p2 == &#39;元&#39;))) {   $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 == &#39;零元&#39; || $m == &#39;零万&#39; || $m == &#39;零亿&#39; || $m == &#39;零零&#39;) {   $left = substr($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) == &#39;零&#39;) {  $c = substr($c, 0, strlen($c)-3);
 } // if there is a &#39;0&#39; 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(  &#39;０&#39; => &#39;0&#39;, &#39;１&#39; => &#39;1&#39;, &#39;２&#39; => &#39;2&#39;, &#39;３&#39; => &#39;3&#39;, &#39;４&#39; => &#39;4&#39;,  &#39;５&#39; => &#39;5&#39;, &#39;６&#39; => &#39;6&#39;, &#39;７&#39; => &#39;7&#39;, &#39;８&#39; => &#39;8&#39;, &#39;９&#39; => &#39;9&#39;,  &#39;Ａ&#39; => &#39;A&#39;, &#39;Ｂ&#39; => &#39;B&#39;, &#39;Ｃ&#39; => &#39;C&#39;, &#39;Ｄ&#39; => &#39;D&#39;, &#39;Ｅ&#39; => &#39;E&#39;,  &#39;Ｆ&#39; => &#39;F&#39;, &#39;Ｇ&#39; => &#39;G&#39;, &#39;Ｈ&#39; => &#39;H&#39;, &#39;Ｉ&#39; => &#39;I&#39;, &#39;Ｊ&#39; => &#39;J&#39;,  &#39;Ｋ&#39; => &#39;K&#39;, &#39;Ｌ&#39; => &#39;L&#39;, &#39;Ｍ&#39; => &#39;M&#39;, &#39;Ｎ&#39; => &#39;N&#39;, &#39;Ｏ&#39; => &#39;O&#39;,  &#39;Ｐ&#39; => &#39;P&#39;, &#39;Ｑ&#39; => &#39;Q&#39;, &#39;Ｒ&#39; => &#39;R&#39;, &#39;Ｓ&#39; => &#39;S&#39;, &#39;Ｔ&#39; => &#39;T&#39;,  &#39;Ｕ&#39; => &#39;U&#39;, &#39;Ｖ&#39; => &#39;V&#39;, &#39;Ｗ&#39; => &#39;W&#39;, &#39;Ｘ&#39; => &#39;X&#39;, &#39;Ｙ&#39; => &#39;Y&#39;,  &#39;Ｚ&#39; => &#39;Z&#39;, &#39;ａ&#39; => &#39;a&#39;, &#39;ｂ&#39; => &#39;b&#39;, &#39;ｃ&#39; => &#39;c&#39;, &#39;ｄ&#39; => &#39;d&#39;,  &#39;ｅ&#39; => &#39;e&#39;, &#39;ｆ&#39; => &#39;f&#39;, &#39;ｇ&#39; => &#39;g&#39;, &#39;ｈ&#39; => &#39;h&#39;, &#39;ｉ&#39; => &#39;i&#39;,  &#39;ｊ&#39; => &#39;j&#39;, &#39;ｋ&#39; => &#39;k&#39;, &#39;ｌ&#39; => &#39;l&#39;, &#39;ｍ&#39; => &#39;m&#39;, &#39;ｎ&#39; => &#39;n&#39;,  &#39;ｏ&#39; => &#39;o&#39;, &#39;ｐ&#39; => &#39;p&#39;, &#39;ｑ&#39; => &#39;q&#39;, &#39;ｒ&#39; => &#39;r&#39;, &#39;ｓ&#39; => &#39;s&#39;,  &#39;ｔ&#39; => &#39;t&#39;, &#39;ｕ&#39; => &#39;u&#39;, &#39;ｖ&#39; => &#39;v&#39;, &#39;ｗ&#39; => &#39;w&#39;, &#39;ｘ&#39; => &#39;x&#39;,  &#39;ｙ&#39; => &#39;y&#39;, &#39;ｚ&#39; => &#39;z&#39;,  &#39;（&#39; => &#39;(&#39;, &#39;）&#39; => &#39;)&#39;, &#39;〔&#39; => &#39;[&#39;, &#39;〕&#39; => &#39;]&#39;, &#39;【&#39; => &#39;[&#39;,  &#39;】&#39; => &#39;]&#39;, &#39;〖&#39; => &#39;[&#39;, &#39;〗&#39; => &#39;]&#39;, &#39;｛&#39; => &#39;{&#39;, &#39;｝&#39; => &#39;}&#39;, &#39;《&#39; => &#39;<&#39;,  &#39;》&#39; => &#39;>&#39;,  &#39;％&#39; => &#39;%&#39;, &#39;＋&#39; => &#39;+&#39;, &#39;—&#39; => &#39;-&#39;, &#39;－&#39; => &#39;-&#39;, &#39;～&#39; => &#39;-&#39;,  &#39;：&#39; => &#39;:&#39;, &#39;。&#39; => &#39;.&#39;, &#39;、&#39; => &#39;,&#39;, &#39;，&#39; => &#39;.&#39;, &#39;、&#39; => &#39;.&#39;,  &#39;；&#39; => &#39;;&#39;, &#39;？&#39; => &#39;?&#39;, &#39;！&#39; => &#39;!&#39;, &#39;…&#39; => &#39;-&#39;, &#39;‖&#39; => &#39;|&#39;,  &#39;”&#39; => &#39;"&#39;, &#39;“&#39; => &#39;"&#39;, &#39;&#39;&#39; => &#39;`&#39;, &#39;‘&#39; => &#39;`&#39;, &#39;｜&#39; => &#39;|&#39;, &#39;〃&#39; => &#39;"&#39;,
  &#39;　&#39; => &#39; &#39;,&#39;．&#39; => &#39;.&#39;);
 return strtr($str, $arr);
}

/**
 * 下载
 * @param [type] $filename [description]
 * @param string $dir  [description]
 * @return [type]   [description]
 */
function downloads($filename,$dir=&#39;./&#39;){
 $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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