php常用函数

#删除不为空的目录
function rrmdir($dir) { 
   if (is_dir($dir)) { 
     $objects = scandir($dir); 
     foreach ($objects as $object) { 
       if ($object != "." && $object != "..") { 
         if (filetype($dir."/".$object) == "dir") rrmdir($dir."/".$object); else unlink($dir."/".$object);
        } 
     } 
     reset($objects); 
     rmdir($dir); 
   } 
 }

#批量创建目录 
 function MakeDirectory($dir, $mode = 0755)
 {
    umask(0);
   if (is_dir($dir) || @mkdir($dir,$mode)) return TRUE;
   if (!MakeDirectory(dirname($dir),$mode)) return FALSE;
   return @mkdir($dir,$mode);
 }

#批量创建目录
function recursive_mkdir($path, $mode = 0777) {
     $dirs = explode(DIRECTORY_SEPARATOR , $path);
     $count = count($dirs);
     $path = substr($path, 0, 1) === DIRECTORY_SEPARATOR ?  DIRECTORY_SEPARATOR : '.';
　　　umask(0);
     for ($i = 0; $i < $count; ++$i) {
         $path .= DIRECTORY_SEPARATOR . $dirs[$i];
         
         if (!is_dir($path) && !mkdir($path, $mode)) {
             return false;
         }
     }
     return true;
 }

/**
 * 多进程同时写入一个文件 不支持NFS文件系统
 * @param string $filename
 * @param string $str
 */
function write($filename, $str) {
    $f = fopen ( $filename, "a" );
    if (flock ( $f, LOCK_EX )) {
        fwrite ( $f, $str );
        //sleep(5);
        flock ( $f, LOCK_UN );
    }
    fclose ( $f );
}
write("/home/v_jksong/lock.data", "sjk");

/**
 * 判断是否是合法整形 加强版
 * @param unknown_type $a
 * @return boolean
 */
function is_intval($a) {
    return ((string)$a === (string)(int)$a);
}
// true for ("123", "0", "-1", 0, 11, 9011, 00, 0x12, true)
// false for (" ", "", 1.1, "123.1", "00", "0x123", "123a", "ada", "--1", "999999999999999999999999999999999", false, null, '1 ')

/**
 * 检测一维数组是否相等，如果(string)$v1 === (string)$v2 则为相等
 * @param unknown_type $a
 * @param unknown_type $b
 * @param unknown_type $assoc
 * @return boolean
 */
function array_equal($a, $b, $assoc = true)
{
    $func = 'array_diff';
    if($assoc === true)
    {
        $func = 'array_diff_assoc';
    }
    
    $diff_a_b = $func($a, $b);
    $diff_b_a = $func($b, $a);
    
    if(empty($diff_a_b) && empty($diff_b_a))
    {
        return true;
    }
    
    return false;
}

//解析 js中escap编码的字符串 
function js_unescape($str)
{
    $ret = '';
    $len = strlen($str);
    for ($i = 0; $i < $len; $i++) {
        if ($str[$i] == '%' && $str[$i+1] == 'u') {
            $val = hexdec(substr($str, $i+2, 4));
            if ($val < 0x7f) $ret .= chr($val);
            else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f));
            else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f));
            $i += 5;
        } else if ($str[$i] == '%') {
            $ret .= urldecode(substr($str, $i, 3));
            $i += 2;
        } else $ret .= $str[$i];
    }
    return $ret;
}

echo js_unescape('%u4E03%u5915%u628A%u59B9%u5FC5%u5907%20%u56DB%u6B3ESUV%u6700%u9AD8%u964D6.5%u4E07_%u5927%u7CA4%u7F51_%u817E%u8BAF%u7F51');

/**
 * 获取ip地址，注意服务器是双网卡的情况
 * @param unknown_type $dest
 * @param unknown_type $port
 * @return unknown
 */
function my_ip($dest='64.0.0.0', $port=80)
{
    $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
    socket_connect($socket, $dest, $port);
    socket_getsockname($socket, $addr, $port);
    socket_close($socket);
    return $addr;
}

/**
 * 用以取代file_get_contents函数，可以设置主机名以及超时时间等设置
 * @param $url 主机名
 * @param $path 路径
 * @param $port=80 端口
 * @param $timeout=10 超时设置，单位秒
 * @return integer/string -1:连接不上主机 -2:发送请求串失败
 */
function get_file_contents($url,$path,$port=80,$timeout=10)
{
    $errno=null;
    $errstr=null;
    $fp=fsockopen($url,$port);
    if(!$fp)
    {
        return -1;
    }
    $command='GET '.$path.' HTTP/1.1'."
";
    $command.='Accept: */*'."
";
    $command.='Accept-Language: zh-cn'."
";
    $command.='Host: '.$url."
";
    $command.='Connection: Close'."
";
    $command.="
";
    $flag=fwrite($fp,$command);
    if(!$flag)
    {
        fclose($fp);
        return -2;
    }
    stream_set_timeout($fp,$timeout);
    $tmp_ret_str="";
    $flag=false;
    while(!feof($fp))
    {
        $tmp_cur_line=fgets($fp,2048);
        if($flag)
        {
            $tmp_ret_str.=$tmp_cur_line;
        }
        if($tmp_cur_line=="
")
        {
            $flag=true;
        }
    }
    fclose($fp);

    return $tmp_ret_str;
}

/**
 * URL取得相应数据的函数
 *
 * @param string $url 完整URL
 * @param int $timeout 超时时间
 * @return string/errorno
 */
function get_url_contents($url,$timeout=10)
{
    $command='wget --timeout '.$timeout.' -q -O- "'.$url.'"';
    $tmp_ret_str='';
    $fp=popen($command,"r");
    if($fp==false)
    {
        return -1;
    }
    while(!feof($fp))
    {
        $tmp_ret_str.=fgets($fp);
    }
    pclose($fp);
    return $tmp_ret_str;
}

/**
 * 获取当前内存情况
* @return string
*/
function memory_usage($isEcho = 0)
{
    $memUsage = memory_get_usage();
    $unitArr = array("B", "K", "M", "G");

    $used =  @round($memUsage/pow(1024, ($i=floor(log($memUsage, 1024)))), 2)."".($unitArr[$i]);
    if($isEcho)
    {
    ee($used);
    }
    return $used;
}