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常用的PHP操作函数分享

小云云
小云云asal
2018-03-13 11:24:341310semak imbas


1、PHP加密解密

PHP加密和解密函数可以用来加密一些有用的字符串存放在数据库里,并且通过可逆解密字符串,该函数使用了base64和MD5加密和解密。

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; 
    } 
}

使用方法如下:

//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生成随机字符串

当我们需要生成一个随机名字,临时密码等字符串时可以用到下面的函数:

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

使用方法如下:

echo generateRandomString(20);

3、PHP获取文件扩展名(后缀)

以下函数可以快速获取文件的扩展名即后缀。

function getExtension($filename){ 
  $myext = substr($filename, strrpos($filename, &#39;.&#39;)); 
  return str_replace(&#39;.&#39;,&#39;&#39;,$myext); 
}

使用方法如下:

$filename = &#39;我的文档.doc&#39;; 
echo getExtension($filename);

4、PHP获取文件大小并格式化

以下使用的函数可以获取文件的大小,并且转换成便于阅读的KB,MB等格式。

function formatSize($size) { 
    $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB"); 
    if ($size == 0) {  
        return(&#39;n/a&#39;);  
    } else { 
      return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);  
    } 
}

使用方法如下:

$thefile = filesize(&#39;test_file.mp3&#39;); 
echo formatSize($thefile);

5、PHP替换标签字符

有时我们需要将字符串、模板标签替换成指定的内容,可以用到下面的函数:

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

使用方法如下:

$string = &#39;The {b}anchor text{/b} is the {b}actual word{/b} or words used {br}to describe the link {br}itself&#39;; 
$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列出目录下的文件名

如果你想列出目录下的所有文件,使用以下代码即可:

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

使用方法如下:

listDirFiles(&#39;home/some_folder/&#39;);

7、PHP获取当前页面URL

以下函数可以获取当前页面的URL,不管是http还是https:

function curPageURL() { 
    $pageURL = &#39;http&#39;; 
    if (!empty($_SERVER[&#39;HTTPS&#39;])) {$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; 
}

使用方法如下:

echo curPageURL();

8、PHP强制下载文件

有时我们不想让浏览器直接打开文件,如PDF文件,而是要直接下载文件,那么以下函数可以强制下载文件,函数中使用了application/octet-stream头类型。

function download($filename){ 
    if ((isset($filename))&&(file_exists($filename))){ 
       header("Content-length: ".filesize($filename)); 
       header(&#39;Content-Type: application/octet-stream&#39;); 
       header(&#39;Content-Disposition: attachment; filename="&#39; . $filename . &#39;"&#39;); 
       readfile("$filename"); 
    } else { 
       echo "Looks like file does not exist!"; 
    } 
}

使用方法如下:

download(&#39;/down/test_45f73e852.zip&#39;);

9、PHP截取字符串长度

我们经常会遇到需要截取字符串(含中文汉字)长度的情况,比如标题显示不能超过多少字符,超出的长度用…表示,以下函数可以满足你的需求。

/* 
 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, $code = &#39;UTF-8&#39;){ 
    if($code == &#39;UTF-8&#39;){ 
        $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/"; 
        preg_match_all($pa, $string, $t_string); 

        if(count($t_string[0]) - $start > $sublen) return join(&#39;&#39;, array_slice($t_string[0], $start, $sublen))."..."; 
        return join(&#39;&#39;, array_slice($t_string[0], $start, $sublen)); 
    }else{ 
        $start = $start*2; 
        $sublen = $sublen*2; 
        $strlen = strlen($string); 
        $tmpstr = &#39;&#39;; 

        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; 
    } 
}

使用方法如下:

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

10、PHP获取客户端真实IP

我们经常要用数据库记录用户的IP,以下代码可以获取客户端真实的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[&#39;REMOTE_ADDR&#39;]) && $_SERVER[&#39;REMOTE_ADDR&#39;] && strcasecmp($_SERVER[&#39;REMOTE_ADDR&#39;], "unknown")) 
                    $ip = $_SERVER[&#39;REMOTE_ADDR&#39;]; 
                else 
                    $ip = "unknown"; 
    return ($ip); 
}

使用方法如下:

echo getIp();

11、PHP防止SQL注入

我们在查询数据库时,出于安全考虑,需要过滤一些非法字符防止SQL恶意注入,请看一下函数:

function injCheck($sql_str) {  
    $check = preg_match(&#39;/select|insert|update|delete|&#39;|/*|*|../|./|union|into|load_file|outfile/&#39;, $sql_str);
    if ($check) { 
        echo &#39;非法字符!!&#39;; 
        exit; 
    } else { 
        return $sql_str; 
    } 
}

使用方法如下:

echo injCheck(&#39;1 or 1=1&#39;);

12、PHP页面提示与跳转

我们在进行表单操作时,有时为了友好需要提示用户操作结果,并跳转到相关页面,请看以下函数:

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; 
}

使用方法如下:

message(&#39;操作提示&#39;,&#39;操作成功!&#39;,&#39;https://segmentfault.com/&#39;);

13、PHP计算时长

我们在处理时间时,需要计算当前时间距离某个时间点的时长,如计算客户端运行时长,通常用hh:mm:ss表示

function changeTimeType($seconds) { 
    if ($seconds > 3600) { 
        $hours = intval($seconds / 3600); 
        $minutes = $seconds % 3600; 
        $time = $hours . ":" . gmstrftime(&#39;%M:%S&#39;, $minutes); 
    } else { 
        $time = gmstrftime(&#39;%H:%M:%S&#39;, $seconds); 
    } 
    return $time; 
}

使用方法如下:

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

下面是获取客户端IP,字符串截取,下载等,详情请查看如下代码:

<?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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