Warning: A non-numeric value encountered

Recently updated to PHP 7.1 and start getting following error

>Warning: A non-numeric value encountered in on line 29

Here is what line 29 looks like

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

On localhost all works fine..

Any ideas how to tackle this or what it is ?

Not exactly the issue you had but the same error for people searching.

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

Coming back to PHP I concatenated two strings with + instead of . and got that error.

It seems that in PHP 7.1, a Warning will be emitted if a non-numeric value is encountered. See this link.

Here is the relevant portion that pertains to the Warning notice you are getting:

> New E_WARNING and E_NOTICE errors have been introduced when invalid > strings are coerced using operators expecting numbers or their > assignment equivalents. An E_NOTICE is emitted when the string begins > with a numeric value but contains trailing non-numeric characters, and > an E_WARNING is emitted when the string does not contain a numeric > value.

I'm guessing either $item['quantity'] or $product['price'] does not contain a numeric value, so make sure that they do before trying to multiply them. Maybe use some sort of conditional before calculating the $sub_total, like so:

<?php

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

You can solve the problem without any new logic by just casting the thing into the number, which prevents the warning and is equivalent to the 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 would remain unset if non-numeric values are encountered. For example, if you print out $sub_total, you would get an empty string, which is probably wrong in an invoice. - by casting you make sure that $sub_total is an integer.)

In my case it was because of me used + as in other language but in PHP strings concatenation operator is ..

Hello, In my case using (WordPress) and PHP7.4 I get a warning about numeric value issue. So I changed the old code as follow:

From:

$val = $oldval + $val;

To:

$val = ((int)$oldval + (int)$val);

Now the warning disappeared :)

I had this issue with my pagination forward and backward link .... simply set (int ) in front of 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 }
?>

This was happening to me specifically on PHPMyAdmin. So to more specifically answer this, 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 this:

$endpos = 0;
if (!empty($_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 that save's someone some trouble...

I encountered the issue in phpmyadmin with PHP 7.3. Thanks @coderama, I changed 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'];

into

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

Fixed.

Try this.

$sub_total = 0;

and within your loop now you can use this

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

It should solve your problem.

Check if you're not incrementing with some variable that its value is an empty string like ''.

Example:

$total = '';
$integers = range(1, 5);

foreach($integers as $integer) {
    $total += $integer;
}

PHP 7.1-7.4

This warning happens when you have a non-numeric string in an expression (probably +, -, *, or /) where PHP is expecting to see another scalar (int, float, or bool). There are two likely situations where this happens:

• You did not mean to use an operation that expects a scalar. For example, + (addition) when you meant . (concatenation).
• You were expecting a number, but the value you used was not even close to a number. Figure out what your non-number is, and handle accordingly.
  • For example, if you have echo 3 + $variable and your $variable is the string "n/a", then you might decide to instead echo "not applicable". Or maybe you decide that all non-numeric values should be treated as 0 and cast to the .

Fix these warnings! In PHP 8, this becomes a fatal error: "Uncaught TypeError: Unsupported operand types".

PHP 8

Code that used to produce the warning "A non well formed numeric value encountered" in PHP 7.1-7.4 now gives this warning instead. This happens when you have a "trailing string", which is a string that starts with a number, but is followed by something non-numeric. (It will still do the math but you should fix this! In the future it may be upgraded to an error.) For example:

echo 3 + "30 meters";

Output:

> Warning: A non-numeric value encountered in [...][...] on line X
33

Fix:

echo 3 + (float) "30 meters";

I just looked at this page as I had this issue. For me I had floating point numbers calculated from an array but even after designating the variables as floating points the error was still given, here's the simple fix and example code underneath which was causing the issue.

Example PHP

<?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
?>

$sn = 0;//increment the serial number, then add the sn to job
for($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's the code I had which looped and created new html div elements. The code worked fine and the elements were formed, but i got the same warning in the error_log.

After reading the useful other answers, I figured that I was summing up a string and a number in the erroneous line. So I changed the code at that line to

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

Now the code works as earlier but with no warnings this time. Hope this example would be useful to someone.

Solve this error on WordPress

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

Simple solution here!

1. locate a file of wp-includes\SimplePie\Parse\Date.php
2. find a 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])));

$sub_total_price = 0; 

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

echo $sub_total_price;

it's working 100% :)

That's happen usually when you con-cat strings with + sign. In PHP you can make concatenation using dot sign (.) So sometimes I accidentally put + sign between two strings in PHP, and it show me this error, since you can use + sign in numbers only.

Make sure that your column structure is INT.

If non-numeric value encountered in your code try below one. The below code is converted to float.

$PlannedAmount = ''; // empty string ''
     
if(!is_numeric($PlannedAmount)) {
           $PlannedAmount = floatval($PlannedAmount);
 }

 echo $PlannedAmount; //output = 0

in PHP if you use + for concatenation you will end up with this error. In php + is a arithmetic operator. https://www.php.net/manual/en/language.operators.arithmetic.php

wrong use of + operator:

            "<label for='content'>Content:</label>"+
            "<textarea class='form-control col-xs-12' rows='7'cols='100' id='content' name='content'>"+$initcontent+"</textarea>'"+                 
            "</div>";

use . for concatenation

$output = "<div class='from-group'>".
            "<label for='content'>Content:</label>".
            "<textarea class='form-control col-xs-12' rows='7'cols='100' id='content' name='content'>".$initcontent."</textarea>'".                 
            "</div>";

You need to verify that you are dealing with a number:

 if (is_numeric($item['quantity'])) {
 if (is_numeric($product['price'])) {
    echo $item['quantity'] * $product['price'];
 } else {
    echo $item['quantity']. $product['price'];
 }
 } else {
    echo $item['quantity']. $product['price'];
 }

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

replace by:

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

I received this error after adding two formatted variables using the number_format() method. The reason is because this method usually formats your number with a , unless you specified the optional separator argument as null. For example, let's say I have the following code:

$subtotal = 6556.7;
$vat = number_format(0.175 * $subtotal, 2);            // 1,147.42
$transactionfee = number_format(0.02 * $subtotal, 2);  // 131.13
$total = $subtotal + $vat + $transactionfee;           // 6556.7 + 1,147.42 + 131.13 = ERROR

This would trigger the following error because one of the variables contains a , which is invalid for a float type:

> Warning: A non-numeric value encountered ...

The number_format() method has the following method signature:

> number_format(number,decimals,decimalpoint,separator).

By specifying the separator argument as '', this error could be fixed as follows:

$subtotal = 6556.7;
$vat = number_format(0.175 * $subtotal, 2, '.', '');           //1147.42
$transactionfee = number_format(0.02 * $subtotal, 2, '.', ''); //131.13
$total = $subtotal + $vat + $transactionfee;   // // 6556.7 + 1147.42 + 131.13 = 7835.25

It might be late but for those who still have been banging their head around like I was. In my case it was legacy project developed in PHP 5.6 but when I need to modify it I was running PHP 7.1. I didn't bother to change it.(Had to pay for it) So the issue is PHP 7.1 is more strict than PHP 5.6

In PHP 5.6 following is allowed.

$totalPrice = ' '
$someFoo = $totalPrice + 100
// This is totally fine. And PHP will not yell about it.

While in PHP 7.1 it will throw an error

$totalPrice = ' '
$someFoo = $totalPrice + 100
// Error : A non-numeric value encountered.

So after changing that line to $totalPrice = 0 everything worked.

Hope someone will find it useful.

Thank you everyone. I have had:

<?php echo $data['style_headerheight']-3; ?>

which gave the error: > PHP Warning: A non-numeric value encountered in framework/inc/customcss.php on line 78

To fix, I replaced that by:

<?php echo ((int)$data['style_headerheight']-(int)3); ?>