[SOLVED] NULL Help

[Clinton]

This says if DOB is 0000-00-00 then ECHO x ELSE echo x.

 

How do I get it to say IF DOB is 0000-00-00 then echo x ELSE IF dob is NULL then echo x ELSE echo x?

 

<tr>
<td align='right'> Date of Birth: </td><td><input type="text" name="dob" value="<? if ($row{'dob'}=='0000-00-00') echo " "; else echo date('n/j/Y',strtotime($row{'dob'})); ?>"></td>
</tr>

[discomatt]

if ( $dob === NULL )

[Clinton]

Thank you!