常用的检查函数

<?php
//安全协议判断
function ssl()
{
    if (isset($_SERVER['HTTPS']) && ('1' == $_SERVER['HTTPS'] || 'on' == strtolower($_SERVER['HTTPS']))) {
        return true;
    } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
        return true;
    }
    return false;
}
// 代理访问检测
function proxy()
{
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) || !empty($_SERVER['HTTP_VIA']) || !empty($_SERVER['HTTP_PROXY_CONNECTION']) || !empty($_SERVER['HTTP_USER_AGENT_VIA'])) {
        return true;
    }
    return false;
}
//机器人检测
function robot()
{
    static $_robot = null;
    if (is_null($_robot)) {
        $spiders  = 'Bot|Crawl|Spider|slurp|sohu-search|lycos|robozilla';
        $browsers = 'MSIE|Netscape|Opera|Konqueror|Mozilla';
        if (preg_match("/($browsers)/", $_SERVER['HTTP_USER_AGENT'])) {
            $_robot = false;
        } elseif (preg_match("/($spiders)/", $_SERVER['HTTP_USER_AGENT'])) {
            $_robot = true;
        } else {
            $_robot = false;
        }
    }
    return $_robot;
}

//浏览器检查
function browser($browser = '')
{
    $browsers = array(
        ".*opera[ /]([0-9.]{1,10})" => "opera",
        ".compatible; MSIE[ /]([0-9.]{1,10}).*" => "ie",
        ".*Firefox/([0-9.+]{1,10})" => "firefox",
        ".Version/([0-9.+]{1,10})" => "safari",
        ".Chrome/([0-9.+]{1,10})" => "chrome"
    );

    $browser_info = array();
    foreach ($browsers as $match => $browser_name) {
        if (preg_match('#' . $match . '#i', $_SERVER["HTTP_USER_AGENT"], $matches)) {
            $browser_info[] = $browser_name;
            $browser_info[] = $matches[1];
            $browser_info[] = $browser_name . ' ' . $matches[1];
        }
    }
	return $browser_info;
    
}

// 判断Ajax方式提交    
function ajax()
{
    if (isset($_SERVER['HTTP_X_REQUESTED_WITH'])) {
        if ('xmlhttprequest' == strtolower($_SERVER['HTTP_X_REQUESTED_WITH']))
            return true;
    }
    return false;
}
function url($v,$filter=false)
{
    if($filter) $v = filter_var($v, FILTER_SANITIZE_URL);
    if (filter_var($v, FILTER_VALIDATE_URL)) {
        return $v;
    } else {
        return false;
    }
}
function ip($v)
{
    if (filter_var($v, FILTER_VALIDATE_IP)) {
        return $v;
    } else {
        return false;
    }
}
function email($v,$filter=false)
{
    if($filter) $v = filter_var($v, FILTER_SANITIZE_EMAIL);
    if (filter_var($v, FILTER_VALIDATE_EMAIL)) {
        return $v;
    } else {
        return false;
    }
}




//身份证检查
function card($id_card)
{
    include_once('card.php');
    if (strlen($id_card) == 18 && idcard_checksum18($id_card)) {
        return $id_card;
    } elseif (strlen($id_card) == 15) {
        $id_card2 = idcard_15to18($id_card);
        if (idcard_checksum18($id_card2)) {
            return $id_card;
        } else {
            return false;
        }
    } else {
        return false;
    }
}

//银行卡号检查
//位数16-20
function bank_card($card)
{
   if (!preg_match('#^\d{16,20}$#', $card)) {
        return false;
    } 
	$return='';
    $arr = include_once('bank_card.php');
    foreach ($arr as $k => $v) {
        if (preg_match('#'.$k.'#U',$card)){
			$v=explode('-',$v,3);
			$return['card']=$card;
			$return['name']=$v[0];
			$return['type']=$v[2];
			return $return;
		}
            
    }
    return false;
}

//手机号码检查
function shouji($phone)
{
    if (preg_match('#^1[3458]{1}\d{9}$#', $phone)) {
        return $phone;
    } else {
        return false;
    }
}



//检查字符
function char($char,$length='1,6',$charlist='')
{
    if (empty($charlist)) {
        $charlist='A-Za-z0-9_';
    }
	if(preg_match('#^['.$charlist.']{'.$length.'}$#',$char)){
		return $char;
	}else{
		return false;
	}
}


//检查验证码
function yzm($yzm)
{
    if (empty($_SESSION['code']) || empty($yzm)) {
        return false;
    }
    if ($_SESSION['code'] == substr(md5(strtolower($yzm)), 8, 28)) {
        return true;
    } else {
        return false;
    }
}

<?php
// 计算身份证校验码，根据国家标准GB 11643-1999 
function idcard_verify_number($idcard_base)
{
    if (strlen($idcard_base) != 17) {
        return false;
    }
    //加权因子 
    $factor             = array(
        7,
        9,
        10,
        5,
        8,
        4,
        2,
        1,
        6,
        3,
        7,
        9,
        10,
        5,
        8,
        4,
        2
    );
    //校验码对应值 
    $verify_number_list = array(
        '1',
        '0',
        'X',
        '9',
        '8',
        '7',
        '6',
        '5',
        '4',
        '3',
        '2'
    );
    $checksum           = 0;
    for ($i = 0; $i < strlen($idcard_base); $i++) {
        $checksum += substr($idcard_base, $i, 1) * $factor[$i];
    }
    $mod           = $checksum % 11;
    $verify_number = $verify_number_list[$mod];
    return $verify_number;
}
// 将15位身份证升级到18位 
function idcard_15to18($idcard)
{
    if (strlen($idcard) != 15) {
        return false;
    } else {
        // 如果身份证顺序码是996 997 998 999，这些是为百岁以上老人的特殊编码 
        if (array_search(substr($idcard, 12, 3), array(
            '996',
            '997',
            '998',
            '999'
        )) !== false) {
            $idcard = substr($idcard, 0, 6) . '18' . substr($idcard, 6, 9);
        } else {
            $idcard = substr($idcard, 0, 6) . '19' . substr($idcard, 6, 9);
        }
    }
    $idcard = $idcard . idcard_verify_number($idcard);
    return $idcard;
}
// 18位身份证校验码有效性检查 
function idcard_checksum18($idcard)
{
    if (strlen($idcard) != 18) {
        return false;
    }
    $idcard_base = substr($idcard, 0, 17);
    if (idcard_verify_number($idcard_base) != strtoupper(substr($idcard, 17, 1))) {
        return false;
    } else {
        return true;
    }
}
?>

<?php
require_once('../lib/check/fun.php');
//安全协议判断
var_dump(ssl());
// 代理访问检测
var_dump(proxy());
//机器人检测
var_dump(robot());
//浏览器检查
var_dump(browser('chrome'));
// 判断Ajax方式提交    
var_dump(ajax());
//url 
//参数url，是否预先过滤url非法字符
var_dump(url('http://127.0.0.1/lizhi/check.php',true));
//ip 
//参数 待检ip
var_dump(ip('11.444.55.66'));
//email
//参数email，是否预先过滤email非法字符
var_dump(email('24556@qq.com',true));
//身份证检查
var_dump(card('350128198506275555'));
//银行卡号检查
//位数16-20
var_dump(bank_card('6258081480887777'));
//手机号码检查
var_dump(shouji('13052561263'));

//检查字符串
//参数 待检字符串 匹配长度 匹配字符集
var_dump(char('ee1301263','1,20'));
//检查验证码
yzm('sss');