function.php

<?php
//加密解密
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;
    }
}

//生成随机字符串
function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
    return $randomString;
}
//获取文件扩展名
function getExtension($filename){
  $myext = substr($filename, strrpos($filename, '.'));
  return str_replace('.','',$myext);
}

//获取文件大小并格式化
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]); 
	}
}

//PHP替换标签字符
function stringParser($string,$replacer){
    $result = str_replace(array_keys($replacer), array_values($replacer),$string);
    return $result;
}

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

//获取当前页面的url
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;
}

//强制下载
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!";
    }
}

/*
 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;
    }
}


//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);
}

//防止注入
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！！'.$sql_str;
		exit;
	} else {
		return $sql_str;
	}
}

//页面提示跳转
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>';
	$str .= '<p>系统将在 <span style="color:blue;font-weight:bold">3</span> 秒后自动跳转,如果不想等待,直接点击 <a href="{$jumpUrl}">这里</a> 跳转</p>';
	$str .= "<script>setTimeout('location.replace(\'".$jumpUrl."\')',2000)</script>";
	$str .= '</div>';
	$str .= '</div>';
	$str .= '</body>';
	$str .= '</html>';
	echo $str;
}


//时间长度转换
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;
}

/**
 * 	作用：将xml转为array
 */
public function xmlToArray($xml)
{		
    //将XML转为array        
    $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);		
	return $array_data;
}

/**
 * 	作用：array转xml
 */
public function arrayToXml($arr)
{
    $xml = "<xml>";
    foreach ($arr as $key=>$val)
    {
    	 if (is_numeric($val))
    	 {
    	 	$xml.="<".$key.">".$val."</".$key.">"; 

    	 }
    	 else
    	 	$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";  
    }
    $xml.="</xml>";
    return $xml; 
}
	
/**
* 获取两个坐标点之间的距离，单位km，小数点后2位
*/
function GetDistance($lat1, $lng1, $lat2, $lng2)
{
	$EARTH_RADIUS = 6378.137;
	$radLat1 = rad($lat1);
	$radLat2 = rad($lat2);
	$a = $radLat1 - $radLat2;
	$b = rad($lng1) - rad($lng2);
	$s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
	$s = $s * $EARTH_RADIUS;
	$s = round($s * 100) / 100;
	return $s;
}