PHP常用的方法 | 积累

 'ok',
                'msg' => $msg,
                'url' => $url
            ));
        } else {
            echo json_encode(array(
                'status' => 'ok',
                'msg' => $msg
            ));
        }
    } else {
        if ($url) {
            echo json_encode(array(
                'status' => 'error',
                'msg' => $msg,
                'url' => $url
            ));
        } else {
            echo json_encode(array(
                'status' => 'error',
                'msg' => $msg
            ));
        }
    }
    exit();
}

//新增log日志
function addLog($msg)
{
    $array = array();
    $array['uid'] = getUserData('id');
    $array['action'] = $msg;
    $array['query'] = D()->getLastSql();
    $array['ip'] = get_client_ip();
    $array['ctime'] = time();
    
    D('Log')->add($array);
}

// 单位自动转换函数
function getRealSize($size) {
    $kb = 1024;         // Kilobyte
    $mb = 1024 * $kb;   // Megabyte
    $gb = 1024 * $mb;   // Gigabyte
    $tb = 1024 * $gb;   // Terabyte

    if ($size < $kb) {
        return $size . " B";
    } else if ($size < $mb) {
        return round($size / $kb, 2) . " KB";
    } else if ($size < $gb) {
        return round($size / $mb, 2) . " MB";
    } else if ($size < $tb) {
        return round($size / $gb, 2) . " GB";
    } else {
        return round($size / $tb, 2) . " TB";
    }
}
//获取ip地址的实际地区
function get_ip_info($ip = '') {
    $url = "http://ip.taobao.com/service/getIpInfo.php?ip=".$ip;
    $data = json_decode(file_get_contents($url),true);
    if($data['code'] === 1){
        return 'IPv4地址不符合格式';
    }else{
        return $data['data']['country'].' '.$data['data']['city'];
    }
}

// 转换月份为英文缩写
function trant_eng($m){
    if($m == 01){
        return 'Jan';
    }elseif($m == 02){
        return 'Feb';
    }elseif($m == 03){
        return 'Mar';
    }elseif($m == 04){
        return 'Apr';
    }elseif($m == 05){
        return 'May';
    }elseif($m == 06){
        return 'Jun';
    }elseif($m == 07){
        return 'Jul';
    }elseif($m == 08){
        return 'Aug';
    }elseif($m == 09){
        return 'Sep';
    }elseif($m == 10){
        return 'Oct';
    }elseif($m == 11){
        return 'Nov';
    }elseif($m == 12){
        return 'Dec';
    }
}

//文本输入
function text_in($str){
    $str=strip_tags($str,'
');
    $str = str_replace(" ", " ", $str);
    $str = str_replace("\n", "
", $str); 
    if(!get_magic_quotes_gpc()) {
      $str = addslashes($str);
    }
    return $str;
}

//文本输出
function text_out($str){
    $str = str_replace(" ", " ", $str);
    $str = str_replace("
", "\n", $str); 
    $str = stripslashes($str);
    return $str;
}

// 获取客户端IP地址
function get_client_ip(){
   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{
       $ip = "unknown";
    }
    if (preg_match('#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $ip)) {
        $ip_array = explode('.', $ip);  
        if($ip_array[0]<=255 && $ip_array[1]<=255 && $ip_array[2]<=255 && $ip_array[3]<=255){
            return $ip;
        }           
    }       
   return "unknown";
}
/**
 * 字符串截取，支持中文和其他编码
 * @static
 * @access public
 * @param string $str 需要转换的字符串
 * @param string $start 开始位置
 * @param string $length 截取长度
 * @param string $charset 编码格式
 * @param string $suffix 截断显示字符
 * @return string
 */
function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {
    if(function_exists("mb_substr"))
        $slice = mb_substr($str, $start, $length, $charset);
    elseif(function_exists('iconv_substr')) {
        $slice = iconv_substr($str,$start,$length,$charset);
        if(false === $slice) {
            $slice = '';
        }
    }else{
        $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));
    }
    return $suffix ? $slice.'...' : $slice;
}

// 检查字符串是否是UTF8编码,是返回true,否则返回false
function is_utf8($string){
    if( !empty($string) ) {
        $ret = json_encode( array('code'=>$string) );
        if( $ret=='{"code":null}') {
            return false;
        }
    }
    return true;
}

// 自动转换字符集 支持数组转换
function auto_charset($fContents,$from='gbk',$to='utf-8'){
    $from   =  strtoupper($from)=='UTF8'? 'utf-8':$from;
    $to       =  strtoupper($to)=='UTF8'? 'utf-8':$to;
    if( strtoupper($from) === strtoupper($to) || empty($fContents) || (is_scalar($fContents) && !is_string($fContents)) ){
        //如果编码相同或者非字符串标量则不转换
        return $fContents;
    }
    if(is_string($fContents) ) {
        if(function_exists('mb_convert_encoding')){
            return mb_convert_encoding ($fContents, $to, $from);
        }elseif(function_exists('iconv')){
            return iconv($from,$to,$fContents);
        }else{
            return $fContents;
        }
    }
    elseif(is_array($fContents)){
        foreach ( $fContents as $key => $val ) {
            $_key =     auto_charset($key,$from,$to);
            $fContents[$_key] = auto_charset($val,$from,$to);
            if($key != $_key )
                unset($fContents[$key]);
        }
        return $fContents;
    }
    else{
        return $fContents;
    }
}
//加密函数，可用cp_decode()函数解密，$data：待加密的字符串或数组；$key：密钥；$expire 过期时间
function cp_encode($data,$key='',$expire = 0)
{
    $string=serialize($data);
    $ckey_length = 4;
    $sale = 'zf';
    $key = md5($key.$sale);
    $keya = md5(substr($key, 0, 16).$sale);
    $keyb = md5(substr($key, 16, 16).$sale);
    $keyc = substr(md5(microtime()), -$ckey_length);

    $cryptkey = $keya.md5($keya.$keyc);
    $key_length = strlen($cryptkey);
    
    $string =  sprintf('%010d', $expire ? $expire + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
    $string_length = strlen($string);
    $result = '';
    $box = range(0, 255);

    $rndkey = array();
    for($i = 0; $i <= 255; $i++) 
    {
        $rndkey[$i] = ord($cryptkey[$i % $key_length]);
    }

    for($j = $i = 0; $i < 256; $i++) 
    {
        $j = ($j + $box[$i] + $rndkey[$i]) % 256;
        $tmp = $box[$i];
        $box[$i] = $box[$j];
        $box[$j] = $tmp;
    }

    for($a = $j = $i = 0; $i < $string_length; $i++) 
    {
        $a = ($a + 1) % 256;
        $j = ($j + $box[$a]) % 256;
        $tmp = $box[$a];
        $box[$a] = $box[$j];
        $box[$j] = $tmp;
        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
    }
    return $keyc.str_replace('=', '', base64_encode($result));      
}
//cp_encode之后的解密函数，$string待解密的字符串，$key，密钥
function cp_decode($string,$key='')
{
    $ckey_length = 4;
    $sale = 'zf';
    $key = md5($key.$sale);
    $keya = md5(substr($key, 0, 16).$sale);
    $keyb = md5(substr($key, 16, 16).$sale);
    $keyc = substr($string, 0, $ckey_length);
    
    $cryptkey = $keya.md5($keya.$keyc);
    $key_length = strlen($cryptkey);
    
    $string =  base64_decode(substr($string, $ckey_length));
    $string_length = strlen($string);
    
    $result = '';
    $box = range(0, 255);

    $rndkey = array();
    for($i = 0; $i <= 255; $i++) 
    {
        $rndkey[$i] = ord($cryptkey[$i % $key_length]);
    }

    for($j = $i = 0; $i < 256; $i++) 
    {
        $j = ($j + $box[$i] + $rndkey[$i]) % 256;
        $tmp = $box[$i];
        $box[$i] = $box[$j];
        $box[$j] = $tmp;
    }

    for($a = $j = $i = 0; $i < $string_length; $i++) 
    {
        $a = ($a + 1) % 256;
        $j = ($j + $box[$a]) % 256;
        $tmp = $box[$a];
        $box[$a] = $box[$j];
        $box[$j] = $tmp;
        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
    }
    if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
        return unserialize(substr($result, 26));
    }
    else
    {
        return '';
    }   
}

//遍历删除目录和目录下所有文件
function del_dir($dir){
    if (!is_dir($dir)){
        return false;
    }
    $handle = opendir($dir);
    while (($file = readdir($handle)) !== false){
        if ($file != "." && $file != ".."){
            is_dir("$dir/$file")?   del_dir("$dir/$file"):@unlink("$dir/$file");
        }
    }
    if (readdir($handle) == false){
        closedir($handle);
        @rmdir($dir);
    }
}