php常用自定义函数 2

其他 2018-10-19 04:09:54 阅读次数: 0

主要方法包含 取文件的后缀名 取随机字符串 使用加密和解密字符串函数 获取文件的大小 对字符串使用替换字符 获取web服务器的文件路径 获取当前页面的URL 检测浏览器语言 创建一个目录树 下载本目录下的某个文件 页面提示与跳转 获取各种编码的固定长度 取得用户的真实ip地址 数组值转换 js的unescape函数 unescape函数 防止SQL注入

/*
 * 取文件的后缀名
 */
function getExtension($filename){ 
 $myext = substr($filename, strrpos($filename, '.')); //取得的字符串为 .doc
 return str_replace('.','',$myext); //参数分别为 。。。
}

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

/*
 * 取随机字符串
 * length  长度 默认10
 */
function omString($length = 10) { 
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randomString = ''; 
    for ($i = 0; $i < $length; $i++) { 
        $randomString .= $characters[rand(0, strlen($characters) - 1)]; 
    } 
    return $randomString; 
}

echo omString(20);



/*
 * 使用加密和解密字符串函数
 * key 加密密码
 * string 加密字段
 * decrypt 加密(0)或解密(1)  
*/
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; 
    } 
}
echo encryptDecrypt('eily', '玉娟',0); echo "<br />";
echo encryptDecrypt('eily', '6anhA2GKZLV/sn91lnZ/KSgnrfD05Mihj8ARQ8SAE7A=',1);



/*
 *  获取文件的大小
 */
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]);  
    } 
}

$thefile = filesize('jquery-2.0.0.min.js'); 
echo formatSize($thefile);



/*
 * 对字符串使用替换字符
 */
function stringParser($string,$replacer){ 
    $result = str_replace(array_keys($replacer), array_values($replacer),$string); 
    return $result; 
}

$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('{b}' => '<b>','{/b}' => '</b>','{br}' => '<br />'); 




/*
 * 获取web服务器的文件路径
 */
function listDirFiles($DirPath){ 
    if($dir = opendir($DirPath)){ 
         while(($file = readdir($dir))!== false){ 
                if(!is_dir($DirPath.$file)) 
                { 
                    echo "filename: $file<br />"; 
                } 
         } 
    } 
}

listDirFiles('/Users/eily/Documents');




/*
 * 获取当前页面的URL，不管是http还是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; 
}

echo curPageURL();



--------------------------------------------------------------------------------

/*
 * 获取编码字符串的指定长度，效果如下
 * jQuery插件实现的加载图片和页面...
 */
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; 
    } 
}

$str = "jQuery插件实现的加载图片和页面效果"; 
echo cutStr($str,21,0,'');                 //3的倍数


--------------------------------------------------------------------------------

/*
 * 取得用户的真实ip地址
 */
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); 
}

echo getIp();


--------------------------------------------------------------------------------

/*
 * PHP防止SQL注入
 */
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; 
    } 
}

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




/*
 * PHP页面提示与跳转
 */
function message($msgTitle,$message,$jumpUrl){ 
    $str = '<!DOCTYPE HTML>'; 
    $str .= '<html>'; 
    $str .= '<head>'; 
    $str .= '<meta charset="utf-8">'; 
    $str .= '<title>页面提示</title>'; 
    $str .= '<style type="text/css">'; 
    $str .= '*{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}'; 
    $str .= '</style>'; 
    $str .= '</head>'; 
    $str .= '<body>'; 
    $str .= '<div class="message">'; 
    $str .= '<h3>'.$msgTitle.'</h3>'; 
    $str .= '<div class="msg_txt">'; 
    $str .= '<h4 class="red">'.$message.'</h4>'; 
    $str .= '<p id="tz1">系统将在 <span style="color:blue;font-weight:bold">3</span> 秒后自动跳转,如果不想等待,直接点击 <a href="'.$jumpUrl.'">这里</a> 跳转</p>'; 
    $str .= "<script>setTimeout('location.href=".'"'.$jumpUrl.'"'."',2000)</script>"; 
    $str .= '</div>'; 
    $str .= '</div>'; 
    $str .= '</body>'; 
    $str .= '</html>'; 
    echo $str; 
}

message('操作提示','操作成功！','ajax.html');



/*
 *计算时长
 */
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; 
}

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




/*
 *获取客户端IP
 */
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 端IP
 */
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'];
  }
}
getOnlineIp();



/*
 *获取url
 */
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;
}
echo  getUrl();



/*
 * 获取url的路径
 */
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);
}

echo getSiteUrl();




/*
 *  获取各种编码的固定长度
 */
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) {
  	$slice=($slice.'...');
    return $slice;
  }
  return $slice;
}
$ss='按时打算的撒的撒打算的撒的撒的撒的撒的撒的的撒的123';
echo msubstr($ss,0,11,'utf-8')."...";




/*
 * js的escape函数
 */
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;
}
$ss='aaaaaaaaaa';
echo escape($ss);




/*
 * js的unescape函数
 */
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);
}
$ss='aaaaaaaaaa';
echo escape($ss);


--------------------------------------------------------------------------------


/*
 * 数组值转换
 */
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);
}

echo makeSemiangle('〖');





/*
 * 下载本目录下的某个文件
 */
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);
 	}
 }
echo downloads('aj.php');




/*
 * 创建一个目录树
 */
function mkdirs($dir, $mode = 0777) {
 if (!is_dir($dir)) {
  mkdirs(dirname($dir), $mode);
  return mkdir($dir, $mode);
 }
 return true;
}
mkdir ( "/aa/to/my/dir" ,  0700 );




/*
 *  检测浏览器语言
 */
function get_client_language($availableLanguages, $default='en'){
    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
 
        foreach ($langs as $value){
            $choice=substr($value,0,2);
            if(in_array($choice, $availableLanguages)){
                return $choice;
            }
        }
    } 
    return $default;
}

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