CODEWITHSUNDEEP
phpphp-7.2
William Orellana
William Orellana

Reputation: 127

PHP Warning: A non-numeric value encountered

I'm getting the following error "PHP Warning: A non-numeric value encountered on line 11". The following code is for a pagination. I have tried everything I know, not sure what else to do. Any help is appreciated.

8 $rowsPerPage = 20;
9 if(isset($_GET['page'])){$pageNum = $_GET['page'];}
10 if(empty($pageNum)) {$pageNum = 1;}
11 $offset = ($pageNum - 1) * $rowsPerPage;

Upvotes: 1

Views: 12630

Answers (3)

Don't Panic
Don't Panic

Reputation: 41820

If $_GET['page'] is non-numeric don't just convert it to an int to get rid of the warning. If it's non-numeric, converting it to a number will prevent the warning, but because non-numeric values will always be converted to zero, your pagination will never work.

If you want your pagination to work properly, you need to handle the warning by discovering why $_GET['page'] is non-numeric and fixing that. Use a debugger or var_dump($_GET['page'] to see what's actually in it. After you find that, you should be able to trace it back to whatever is making the request and correct the error there.

Upvotes: 2

James
James

Reputation: 4803

Something is not numeric (as obvious as that sounds, it is the error) and given you manually set all things to integer other than the GET value, try this:

$rowsPerPage = 20;
if (isset($_GET['page'])) {
    $pageNum = (int) $_GET['page'];
}
if(empty($pageNum)) {
    $pageNum = 1;
}
$offset = ($pageNum - 1) * $rowsPerPage;

Notice the cast to int for the GET param.

You could also just cast to int and PHP will default to integer 0 if it's not already int: 

$pageNum = (int) $_GET['page'];

Couldn't help myself - you can also use a ternary to make your setting of the $pageNum cleaner (IMO): 

$rowsPerPage = 20;

$pageNum = isset($_GET['page'])
    ? (int) $_GET['page']
    : 1;

$offset = ($pageNum - 1) * $rowsPerPage;

Upvotes: 3

Adam
Adam

Reputation: 1140

Seems like $pageNum is non-numeric, i.e. string, try:

$offset = (intval($pageNum) - 1) * $rowsPerPage;

Upvotes: 2

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