PHP ถ้าจะส่งค่าพารามิเตอร์ไปพร้อมกับ URL จะต้องทำไงค่ะ

<a href="Sms.php?var=<?=$ResultDate;?>">go</a>

while($dbarr = mysql_fetch_array($result)) :

	if($ResultDate == $now){
		<a href="Sms.php?var=<?=$Mobile;?>">go</a>
		exit() ;
	}
	
	else if($ResultDate != $now){
		echo "<meta http-equiv='refresh' content='2 ;url=LoginAdmin.php'>" ;
		exit() ;
	}
endwhile;

?>

while($dbarr = mysql_fetch_array($result)) :

	if($ResultDate == $now){
		<a href="Sms.php?var=<?=$Mobile;?>">go</a>
		exit() ;
	}
	
	else if($ResultDate != $now){
		echo "<meta http-equiv='refresh' content='2 ;url=LoginAdmin.php'>" ;
		exit() ;
	}
endwhile;

?>

if($ResultDate == $now){ ?>
		<a href="Sms.php?var=<?=$Mobile;?>">go</a>
<?php 
		exit() ;
	}

if($ResultDate == $now){ 
		echo "<a href='Sms.php?var=$Mobile'>go</a>"; 

		exit() ;
	}