<?php 
function strexists($string, $find) {
	return !(strpos($string, $find) === FALSE);
}

function dstrpos($string, $arr) {
	if(empty($string)) return false;
	foreach((array)$arr as $v) {
		if(strpos($string, $v) !== false) {
			return true;
		}
	}
	return false;
}

function checkmobile() {
	$useragent = strtolower($_SERVER['HTTP_USER_AGENT']);
	$ualist = array('android', 'midp', 'nokia', 'mobile', 'iphone', 'ipod', 'blackberry', 'windows phone');
	if((dstrpos($useragent, $ualist) || strexists($_SERVER['HTTP_ACCEPT'], "VND.WAP") || strexists(isset($_SERVER['HTTP_VIA']),"wap"))){
		return true;
	}else{
	    return false;
	}
}

function daddslashes($string) {
	if(is_array($string)) {
		foreach($string as $key => $val) {
			$string[$key] = daddslashes($val);
		}
	} else {
		$string = addslashes($string);
	}
	return $string;
}
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
    $ckey_length = 4;
    $key = md5($key ? $key : ENCRYPT_KEY);
    $keya = md5(substr($key, 0, 16));
    $keyb = md5(substr($key, 16, 16));
    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()) , -$ckey_length)) : '';
    $cryptkey = $keya . md5($keya . $keyc);
    $key_length = strlen($cryptkey);
    $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($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]));
    }
    if ($operation == 'DECODE') {
        if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb) , 0, 16)) {
            return substr($result, 26);
        } else {
            return '';
        }
    } else {
        return $keyc . str_replace('=', '', base64_encode($result));
    }
}

function cdnpublic($cdnpublic) {
    if(empty($cdnpublic)){
        return '.';
    }
    else{
        return $cdnpublic.$conf['version'];
    }
  
}


function background() {
    if (empty($conf['background'])){if (file_exists(ROOT.'assets/img/background.jpg'))return '../assets/img/background.jpg';else return '../assets/img/bing.php';} 
    else { return $conf['background'];}
}
function update() {
    $update_host = 'cdn.lylme.com'; //程序更新服务器,请勿删除和修改，否则将导致无法接收版本更新和程序报错
    @$update = json_decode(file_get_contents('https://' . $update_host . '/lylmes_page/update.json') , true);
    return $update;
}
function getver($ver) {
    $vn = explode('.', str_replace('v', '', $ver));
    return $vn[0] . sprintf("%02d", $vn[1]) . sprintf("%02d", $vn[2]);
}
function saveSetting($k, $v) {
    global $DB;
    $v = daddslashes($v);
    return $DB->query("UPDATE `lylme_config` SET `v` = '$v' WHERE `lylme_config`.`k` = '$k';");
}
?>