Warning: non-numeric value encountered

Question

Recently upgraded to PHP 7.1 and will start to receive the following error

Warning. Non-numeric value found on line 29

Here is line 29

$sub_total += ($item['quantity'] * $product['price']); 

Everything works fine on the local host.

Any ideas how to solve this or what is it?

Answer 1

It looks like in PHP 7.1 a warning will be issued if a non-numeric value is encountered. See Link.

Here is the relevant part regarding the alert notification you receive:

New errors E_WARNING and E_NOTICE were introduced if they are invalid lines are forcibly used by operators waiting for numbers or their equivalent assignment. E_NOTICE is emitted when a string begins with a numeric value, but contains trailing non-numeric characters, and E_WARNING is emitted when a string does not contain a numeric value.

I assume that $ item ['quantity'] or $ product ['price'] does not contain a numeric value, so make sure they do before trying to multiply them. Perhaps use some conditional signal before computing $ sub_total, for example:

 <?php if (is_numeric($item['quantity']) && is_numeric($product['price'])) { $sub_total += ($item['quantity'] * $product['price']); } else { // do some error handling... } 

Answer 2

Not exactly the problem you had, but the same error for people who are looking.

This happened to me when I spent too much time on JavaScript.

Returning to PHP, I linked the two lines with a “ + ” instead of a “ . ” And I got this error.

Answer 3

You can solve the problem without any new logic by simply entering a thing into a number, which prevents a warning and is equivalent to behavior in PHP 7.0 and below:

 $sub_total += ((int)$item['quantity'] * (int)$product['price']); 

(The answer from Daniel Schroeder is not equivalent, because $ sub_total will remain undefined if non-numeric values ​​are encountered. For example, if you print $ sub_total, you will get an empty string, which is probably incorrect in the invoice. - by casting you will make sure that $ sub_total is an integer.)

Answer 4

In my case, it was due to the fact that I used "+", as in other languages, but in PHP the concatenation string is "." ,

Answer 5

This happened to me specifically on PHPMyAdmin. To answer this more specifically, I did the following:

In file:

 C:\ampps\phpMyAdmin\libraries\DisplayResults.class.php 

I changed this:

 // Move to the next page or to the last one $endpos = $_SESSION['tmpval']['pos'] + $_SESSION['tmpval']['max_rows']; 

To that:

 $endpos = 0; if (!empty($_SESSION['tmpval']['pos']) && is_numeric($_SESSION['tmpval']['pos'])) { $endpos += $_SESSION['tmpval']['pos']; } if (!empty($_SESSION['tmpval']['max_rows']) && is_numeric($_SESSION['tmpval']['max_rows'])) { $endpos += $_SESSION['tmpval']['max_rows']; } 

Hope this saves someone from the trouble ...

Answer 6

I had this problem with my pagination of the forward and backward links .... just set (int) before the variable $ Page + 1, and it worked ...

 <?php $Page = (isset($_GET['Page']) ? $_GET['Page'] : ''); if ((int)$Page+1<=$PostPagination) { ?> <li> <a href="Index.php?Page=<?php echo $Page+1; ?>"> &raquo;</a></li> <?php } ?> 

Answer 7

Check if you are incrementing a variable that its value is an empty string of type ''.

Example:

 $total = ''; $integers = range(1, 5); foreach($integers as $integer) { $total += $integer; } 

Answer 8

I ran into a problem in phpmyadmin with PHP 7.3. Thanks @coderama, I changed the libraries /DisplayResults.class.php line 855 from

 // Move to the next page or to the last one $endpos = $_SESSION['tmpval']['pos'] + $_SESSION['tmpval']['max_rows']; 

at

 // Move to the next page or to the last one $endpos = (int)$_SESSION['tmpval']['pos'] + (int)$_SESSION['tmpval']['max_rows']; 

Fixed.

Answer 9

Try it.

 $sub_total = 0; 

and in your loop now you can use this

 $sub_total += ($item['quantity'] * $product['price']); 

It should solve your problem.

Answer 10

I just looked at this page as I had this problem. For me, I had floating point numbers calculated from an array, but even after the variables were designated as floating points, an error was still indicated, here is a simple error code and an example under which the problem arose.

PHP example

 <?php $subtotal = 0; //Warning fixed $shippingtotal = 0; //Warning fixed $price = array($row3['price']); $shipping = array($row3['shipping']); $values1 = array_sum($price); $values2 = array_sum($shipping); (float)$subtotal += $values1; // float is irrelevant $subtotal creates warning (float)$shippingtotal += $values2; // float is irrelevant $shippingtotal creates warning ?> 

Answer 11

 $sn = 0;//increment the serial number, then add the sn to job for($x = 0; $x<20; $x++) { $sn++; $added_date = "10/10/10"; $job_title = "new job"; $salary = $sn*1000; $cd = "27/10/2017";//the closing date $ins = "some institution";//the institution for the vacancy $notes = "some notes here";//any notes about the jobs $sn_div = "<div class='sn_div'>".$sn."</div>"; $ad_div = "<div class='ad_div'>".$added_date."</div>"; $job_div = "<div class='job_div'>".$job_title."</div>"; $salary_div = "<div class='salary_div'>".$salary."</div>"; $cd_div = "<div class='cd_div'>".$cd."</div>";//cd means closing date $ins_div = "<div class='ins_div'>".$ins."</div>";//ins means institution $notes_div = "<div class='notes_div'>".$notes."</div>"; /*erroneous line*/$job_no = "job"+$sn;//to create the job rows $$job_no = "<div class='job_wrapper'>".$sn_div.$ad_div.$job_div.$salary_div.$cd_div.$ins_div.$notes_div."</div>"; echo $$job_no;//and then echo each job } 

that I had code that looped and created new html div elements. The code worked fine and the elements were generated, but I got the same warning in error_log.

After reading other useful answers, I thought I was summing up the string and the number in the wrong string. So I changed the code on this line to

 /*erroneous line*/$job_no = "job"&&$sn;//this is the new variable that will create the job rows 

Now the code works as before, but without warnings this time. Hope this example is helpful to someone.

Answer 12

Solve this error on WordPress

Warning: non-numeric value found in C: \ XAMPP \ htdocs \ aad-2 \ wp-includes \ SimplePie \ Parse \ Date.php on line 694

The simple solution is here!

1. find the file wp-includes\SimplePie\Parse\Date.php
2. find the line no. 694
3. you show the code $second = round($match[6] + $match[7]/pow(10, strlen($match[7])));
4. and change this 3.) to this line $second = round((int)$match[6] + (int)$match[7]/pow(10, strlen($match[7])));

Answer 13

 $sub_total_price = 0; foreach($booking_list as $key=>$value) { $sub_total_price += ($price * $quantity); } echo $sub_total_price; 

it works 100% :)

Answer 14

This usually happens when you join lines with a + sign. In PHP you can concatenate using the dot sign (.) So sometimes I accidentally put a + sign between two lines in PHP, and this shows me this error, since you can only use the + sign in numbers.

Answer 15

Make sure your column structure is INT.