PHP Warning: Division by zero error

Question

I getting this error and not sure how to fix it. Line 162 is the first line in the php code. I looked at some of the related questions and all my quote marks seem to be in the right place

Per page:
<input type=text name=per_page value="<?php echo $en['per_page']; ?>" size=6> 
Go to page:
<select name=page size=1>

<?php 
$pages = ceil(sql_num_rows($result)/$en['per_page']); 
for ($k=1;$k<=$pages;$k++) 
   echo '<option value='.$k.($en[page] == $k ? ' selected':'').'>'.
     $k.'</option>';

echo '</select>';   
if ($en[page]<$pages) 
   echo '<input type=submit name=next value="Next page">';
?>

simshaun · Accepted Answer · 2011-02-15 17:56:37Z

3

Try to echo $en['per_page'] and make sure it's got the correct value. (I bet it doesnt).

Unrelated: $en[page] Should probably be $en['page'] (assuming page is really not a constant)

answered Feb 15, 2011 at 17:56

simshaun

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1 Comment

acctman Over a year ago

something like this would fix the problem... $pages = ceil(sql_num_rows($result)/($en['per_page'] == '0' ? '20' : $en['per_page']));

Rudu · Accepted Answer · 2011-02-15 17:55:38Z

3

What's the value of $en['per_page'] (I'm guessing zero)

answered Feb 15, 2011 at 17:55

Rudu

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Comments

John Cartwright · Accepted Answer · 2011-02-15 17:56:31Z

2

Because you cannot have a denominator value of 0.

Check the value of $en['per_page'] > 0 prior to applying it to a division.

answered Feb 15, 2011 at 17:56

John Cartwright

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Comments

slifty · Accepted Answer · 2011-02-15 17:57:00Z

2

Any time you divide by a variable, if the variable is 0 you will get that error.

The way to prevent it would be to check to ensure that $en['per_page'] is not zero, since that appears to be your only division and is probably where your problem is.

answered Feb 15, 2011 at 17:57

slifty

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Comments

gen_Eric · Accepted Answer · 2011-02-15 17:56:26Z

1

If you're getting a divide by zero error, then $en['per_page'] may not be correct. It's probably a zero value.

~~Also, all your HTML attributes need to be in quotes. For example:~~

<input type=text name=per_page

Should be:

<input type="text" name="per_page"

Your array indexes should be quoted too.

$en[page]

Should be:

$en['page']

answered Feb 15, 2011 at 17:56

gen_Eric

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2 Comments

Rudu Over a year ago

They don't need to be in quotes ;) XHTML says they must be, HTML says they can be - HTML spec

gen_Eric Over a year ago

@Rudu: Ah, didn't realize that. I've used XHTML for so long, that I got used to quoting all attributes.

Elmo · Accepted Answer · 2012-01-22 21:59:28Z

0

Here is the solution:

Per page:

<input type=text name=per_page value="<?php echo $en['per_page']; ?>" size=6>

Go to page:

<?php 
$pages = @ceil(sql_num_rows($result)/$en['per_page']); 
for ($k=1;$k<=$pages;$k++) 
   echo '<option value='.$k.($en[page] == $k ? ' selected':'').'>'.
     $k.'</option>';

echo '</select>';   
if ($en[page]<$pages) 
   echo '<input type=submit name=next value="Next page">';
?>

Just used @ before ceil / division.

edited Jan 22, 2012 at 21:59

Elmo

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answered Jan 22, 2012 at 21:31

Ashfaque Ali Solangi

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