<?php
namespace Westdc\Helpers;

class Tools {

    /**
     * 判断是否为UUID字符串
     * @param $uuid
     * @return int
     */
	public static function isUUID($uuid) {
		return preg_match("/^[0-9A-Za-z]{8}-[0-9A-Za-z]{4}-[0-9A-Za-z]{4}-[0-9A-Za-z]{4}-[0-9A-Za-z]{12}$/",$uuid);
	}

    /**
     * @param $str
     * @return bool
     */
    public function isEmail($str){
        return true;
    }

    /**
     * @param $cmd
     */
    public function execBackend($cmd)
    {
        if (substr(php_uname(), 0, 7) == "Windows"){
            pclose(popen("start cmd /c ". $cmd, "r"));
        }
        else {
            exec($cmd . " > /dev/null &");
        }

        return;
    }

    /**
     * 返回的汉语文字信息在windows中是GB2312编码，需要手动改成UTF8
     *  iconv("GB2312","UTF-8",$read);
     * @param $cmd
     * @return array
     */
    public function execFront($cmd)
    {
        $response = array();
        $handle = popen("$cmd 2>&1", 'r');

        while ($read = fread($handle, 20096)) {

            if(!mb_detect_encoding($read, 'UTF-8', true))
                iconv("GB2312","UTF-8",$read);

            $response[] = trim($read);
        }
        pclose($handle);
        flush();

        return $response;
    }

    /**
     * @return string
     */
    public function uuid()
    {
        return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
            // 32 bits for "time_low"
            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),

            // 16 bits for "time_mid"
            mt_rand( 0, 0xffff ),

            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 4
            mt_rand( 0, 0x0fff ) | 0x4000,

            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            mt_rand( 0, 0x3fff ) | 0x8000,

            // 48 bits for "node"
            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
        );
    }
	
	
}