Warning: Division by zero in ....

[Digiboy]

Hi guys, 

 

I have been scratching my head all day long to resolve error division by zero in code below:

 

any thoughts? Thank you

 

<ul>

<?php 

echo "<script type='text/javascript' src='lib/js/jquery.min.js'></script>
	<script type='text/javascript' src='lib/jquery.raty.min.js'></script>";
$rating_cnt = 0;

		while($row = mysql_fetch_array($result))
		{

       $bus_name=$row['name'];
       $bus_address_1=$row['address_1'];
       $bus_address_2=$row['address_2'];
       $bus_address_3=$row['address_3'];
       $bus_town=$row['town'];
       $bus_country=$row['country'];
       $bus_postcode=$row['potscode'];
       $bus_tel=$row['tel'];
	   $bus_website=$row['website'];
       $bus_video=$row['video_link'];
       $bus_about=$row['about'];


       $select=mysql_query("SELECT * FROM towns WHERE id='$bus_town'"); while($myrow=mysql_fetch_array($select)) {$new_town=$myrow['town'];}
        
        
        ///////
		echo "
<div class='business_list'>
<div class='business-bars light-blue'><div class='business-bar-txt'>$bus_name, $new_town</div></div>

<div class='business-row'>
<div class='business-vimeo'><iframe src='http://player.vimeo.com/video/$bus_video' width='150' height='150' frameborder='0' webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe></span></div>
<div class='business-about'>$bus_about</div>
</div>
<div class='row2'>
<div class='bus_vote'>";


$rating_cnt++;
if(isset($_SESSION['account_no']) && $_SESSION['account_no']!='')
{
echo "<input type='hidden' id='prd_id_".$rating_cnt."' name='prd_id_".$rating_cnt."' value='".$myrow['prd_id']."' />
	<div id='business_rate_".$rating_cnt."'></div>
	<script type='text/javascript'>
		$(function() {
		  $.fn.raty.defaults.path = 'lib/img';
	
		  $('#business_rate_".$rating_cnt."').raty({
			path     : 'lib/img',
			cancel   : false,
			cancelOff: 'cancel-off-big.png',
			cancelOn : 'cancel-on-big.png',
			half     : false,
			size     : 24,
			starHalf : 'star-half-big.png',
			starOff  : 'star-off-big.png',
			starOn   : 'star-on-big.png',
			click: function(score, evt) {
				var prd_id = $('#prd_id').val();
				$.ajax({
					type: 'POST',
					url: 'add_rate.php',
					data: { bid: prd_id, rating:score }
					}).done(function( msg ) {
						alert('You add rating on this business successfully.');
				});
			}
		  });
		});
	</script>";
}
else
{
	$total_rate = 0;
	$rating_qry = "SELECT * FROM business_rating WHERE bid='".$myrow['prd_id']."'";
	$rating_res = mysql_query($rating_qry) or die(mysql_error());
	$count_rating = mysql_num_rows($rating_res);
	while($rating_row = mysql_fetch_array($rating_res))
	{
		$total_rate += $rating_row['rate'];
	}
	
	$rating_score =round($total_rate/$count_rating);
	
	echo "<div id='business_rate_".$rating_cnt."'></div>
	<script type='text/javascript'>
		$(function() {
		  $.fn.raty.defaults.path = 'lib/img';
	
		  $('#business_rate_".$rating_cnt."').raty({
			path     : 'lib/img',
			cancel   : false,
			cancelOff: 'cancel-off-big.png',
			cancelOn : 'cancel-on-big.png',
			half     : false,
			size     : 24,
			readonly : true,
			score 	 : ".$rating_score.",
			starHalf : 'star-half-big.png',
			starOff  : 'star-off-big.png',
			starOn   : 'star-on-big.png'
		  });
		});
	</script>";
}
//////////////////

echo"
</div>
<div class='bus_address'><div class='business-bar-txt'>$bus_address_1,$bus_address_2, $bus_address_1</div></div></div>
</div>
<div class='row3'>
<div class='bus_reviews'></div><div class='bus_phone'></div><div class='bus_website'></div>
</div>
<!--    end of row       -->
";
}
	 echo "<div class='results'>$total_pages Results</div>";
 // pagination
 echo $paginate;
	?>
</ul>

 

 

[timothyarden]

Just had a brief look over and I'm guessing its this line: $rating_score =round($total_rate/$count_rating);
Ill have a quick look at the manual

[timothyarden]

It has to be that line
Thats the only place you are really dividing regardless of the round function:
$rating_score =round($total_rate/$count_rating);
either the total_rate or count_rating must be zero

 

hope this helps

[haku]

$count_rating would be zero (it wouldn't be invalid if it $total_rate was zero - it's ok to divide zero, it's just not ok to divide by zero)

[timothyarden]

Might want to read what you posted a second time: "it's ok to divide zero, it's just not ok to divide by zero"

[AyKay47]

Might want to read what you posted a second time: "it's ok to divide zero, it's just not ok to divide by zero"

 

No, that statement is correct.

[Barand]

No, that statement is correct.

In what way?

[AyKay47]

Dividing 0 by anything is 0, dividing by zero is undefined/error?

Edited March 13, 2013 by AyKay47

[Barand]

Apologies, I completely misread the first half of the statement

[timothyarden]

Sorry your correct, when I was reading it late last night I read it as it's ok to divide by zero, it's just not ok to divide by zero

 not "it's ok to divide zero, it's just not ok to divide by zero"