text array not posting as null when empty!

[fishctr]

Hi There,
I am building a form that allows a business to enter at most 2 mailing addresses. i have the form set up so both inputs are there, storing as a post array. the problem is, when i try to use php to enter the data into in the mysql database, it enters empty data even when a field is null.
html

<form method='POST' action='entry2.php' name='entry'>
<table>
<tr><td colspan='4' align='center'>Mailing Address</td></tr>
<tr><td>Street:<input type='text' name='mStreet[]' /></td><td>Zip:
<?php
selectDistinct($connection,'CityCode','zip','mzip[]','97465');
?>
</td></tr>
<tr><td>Street:<input type='text' name='mStreet[]' /></td><td>Zip:
<?php
selectDistinct($connection,'CityCode','zip','mzip[]','97465');
?>
</td></tr></table></form>

php to save to db

if(!empty($mStreet)){
for($i=0;$i<2;$i++){
  $Cityquery = "SELECT cityCode FROM CityCode WHERE zip='{$mzip[$i]}'";
  if(!($result = @ mysql_query($Cityquery,$connection))){showerror();}
  $row = mysql_fetch_array($result);
  $mcityCode[$i] = $row['cityCode'];
  $insertQuery = "INSERT INTO Address VALUES(NULL,1,'{$BID}','{$mStreet[$i]}','{$mcityCode[$i]}')";
  if(!(@ mysql_query($insertQuery, $connection))){showerror();}
  }
  }

p.s. the selectDistinct functions return a list of zip codes that are accepted, and in the php it is used to determine the code that is associated with the zip

[hsriat]

Why didn't you used $_POST[ ] ...?

And do the validation inside the for loop as[php]for ($i=0; $i<2; $i++)
{
if(isset($mStre et[$i]))
{
//save data to db
}
}[/php]