PHP 警告：除以零错误
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PHP Warning: Division by zero error
提问by acctman
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
我收到此错误，但不知道如何解决。第 162 行是 php 代码的第一行。我查看了一些相关问题，我所有的引号似乎都在正确的位置
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">';
?>
回答by Rudu
What's the value of $en['per_page'](I'm guessing zero)
的价值是多少$en['per_page']（我猜是零）
回答by simshaun
Try to echo $en['per_page']and make sure it's got the correct value. (I bet it doesnt).
尝试echo $en['per_page']并确保它具有正确的值。（我打赌它没有）。
Unrelated: $en[page]Should probably be $en['page'](assuming page is really not a constant)
无关：$en[page]应该是$en['page']（假设页面真的不是一个常数）
回答by slifty
Any time you divide by a variable, if the variable is 0 you will get that error.
任何时候你除以一个变量，如果变量为 0，你就会得到那个错误。
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.
防止它的方法是检查以确保 $en['per_page'] 不为零，因为这似乎是您唯一的部门，并且可能是您的问题所在。
回答by John Cartwright
Because you cannot have a denominator value of 0.
因为分母值不能为 0。
Check the value of $en['per_page'] > 0 prior to applying it to a division.
在将 $en['per_page'] > 0 应用于分区之前，请检查它的值。
回答by Rocket Hazmat
If you're getting a divide by zero error, then $en['per_page']may not be correct. It's probably a zero value.
如果您得到除以零错误，则$en['per_page']可能不正确。它可能是一个零值。
Also, all your HTML attributes need to be in quotes.
For example:
此外，您的所有 HTML 属性都需要用引号引起来。例如：
<input type=text name=per_page
Should be:
<input type="text" name="per_page"
<input type=text name=per_page
应该：
<input type="text" name="per_page"
Your array indexes should be quoted too.
你的数组索引也应该被引用。
$en[page]
Should be:
应该：
$en['page']
回答by Ashfaq Ahmed
Here is the solution:
这是解决方案：
Per page:
每页：
<input type=text name=per_page value="<?php echo $en['per_page']; ?>" size=6>
Go to page:
转到页面：
<?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.
只是在 ceil / Division 之前使用了 @。
