php中filter函数验证邮箱、url和ip地址的实例

function isEmail($email){
if(preg_match("/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i",$email )) {
return '邮箱验证OK';
} else {
return '验证不是邮箱';
}
}
?>

$email = '[email protected]';

$result = filter_var($email, FILTER_VALIDATE_EMAIL);

var_dump($result); //string(14) "[email protected]"

$url = 'www.111com.net';
$search = '/---正则N---/';
if(preg_match($search,$url)){
echo '匹配';
}else {
echo '不匹配';
}
?>

$url = "https://www.111cn.net";

$result = filter_var($url, FILTER_VALIDATE_URL);

var_dump($result); //string(22) "https://www.111cn.net"

/**
* 检查IP地址是否正确。
*/
function checkipaddres ($ipaddres) {
$preg="/A((([0-9]?[0-9])|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5])).){3}(([0-9]?[0-9])|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))Z/";
if(preg_match($preg,$ipaddres))return true;
return false;
}

$url = "192.168.1.110";

$result = filter_var($url, FILTER_VALIDATE_IP);

var_dump($result); //string(13) "192.168.1.110"

$url = "2001:DB8:2de::e13";

$result = filter_var($url, FILTER_VALIDATE_IP);

var_dump($result); //string(17) "2001:DB8:2de::e13"

$i = '010';

$result = filter_var(

$i,

FILTER_VALIDATE_INT,

//设定校验的数值范围

array(

'options' => array('min_range' => 1, 'max_range' => 100)

)

);

var_dump($result);//bool(false)

$i = '010';

$result = $i >= 1 && $i

var_dump($result);//bool(true)

$float = 12.312;

$result = filter_var($float, FILTER_VALIDATE_FLOAT);

var_dump($result); //float(12.312)