PHP / Codeigniter：如何获取零值而不是NULL？

Question

I am not sure how clear my question is? But let me explain further. Before a person answers the test the result should be hyphen (-), When the person answers the test and gets a score it should display the score he has received. Now that was all working fine. But I noticed that when I score 0 It still displays as hyphen (-) when it should display 0. I will post my code below:

CODE:

<?php 
 if($skillsets)
 foreach($skillsets as $skill => $percentage){ ?>
 <div class="skill_block">
     <div class="small"><?php echo $skill ?></div>
     <?php if($percentage === 0) { ?>
     <div class="big">0%</div>
     <?php } else if($percentage == NULL) { ?>
     <div class="big">-</div>
     <?php } else { ?>
     <div class="big"><?php echo $percentage ?>%</div>
     <?php } ?>
 </div>
     <?php } ?>

Any help will be greatly appreciated. Thanks

19/01/2016

UPDATE:

The type of $percentage is float

Answer 1

<?php 
if(!empty($skillsets)){ # added { in condition
    foreach($skillsets as $skill => $percentage)
    { ?>
         <div class="skill_block">
             <div class="small"><?php echo $skill ?></div>
             <?php 
             if($percentage == 0 || empty($percentage))  # Changed
             { 
                ?>
                <div class="big">0%</div>
                <?php 
             } 
             else { ?>
                 <div class="big"><?php echo $percentage ?>%</div>
                 <?php 
             } ?>
         </div>
     <?php 
    } 
}
else
{
    echo "skillsets is empty";
}