PHP警告：除以零错误

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">';
?>

Answer 1

$en['per_page']的值是$en['per_page'] （我猜是零）

Answer 2

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)

Answer 3

Because you cannot have a denominator value of 0.

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

Answer 4

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.

Answer 5

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:

$en[page]

Your array indexes should be quoted too.

$en['page']

Should be:

 $en['page'] 

Answer 6

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.