Asked  7 Months ago    Answers:  5   Viewed   73 times

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 ?



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:


if (is_numeric($item['quantity']) && is_numeric($product['price'])) {
  $sub_total += ($item['quantity'] * $product['price']);
} else {
  // do some error handling...
Tuesday, June 1, 2021
answered 7 Months ago

You should point to your vendor/autoload.php at Settings | PHP | PHPUnit when using PHPUnit via Composer.

This blog post has all the details (with pictures) to successfully configure IDE for such scenario:

Related usability ticket:

P.S. The WI-18388 ticket is already fixed in v8.0

Wednesday, March 31, 2021
answered 9 Months ago

On Mac OS X environment variables available in Terminal and for the normal applications can be different, check the related question for the solution how to make them similar.

Note that this solution will not work on Mountain Lion (10.8).

Saturday, May 29, 2021
answered 7 Months ago

Your code (simplified):

struct X
   int mem;
   void f(int param = mem); //ERROR

You want to use a non-static member data as default value for a parameter of a member function. The first question which comes to mind is this : which specific instance of the class the default value mem belongs to?

X x1 = {100};  //mem = 100
X x2 = {200};  //mem = 200

x1.f(); //param is 100 or 200? or something else?

Your answer might be 100 as f() is invoked on the object x1 which has mem = 100. If so, then it requires the implementation to implement f() as:

void f(X* this, int param = this->mem);

which in turn requires the first argument to be initialized first before initialization of other argument. But the C++ standard doesn't specify any initialization order of the function arguments. Hence that isn't allowed. Its for the same reason that C++ Standard doesn't allow even this:

int f(int a, int b = a); //§8.3.6/9

In fact, §8.3.6/9 explicitly says,

Default arguments are evaluated each time the function is called. The order of evaluation of function arguments is unspecified. Consequently, parameters of a function shall not be used in default argument expressions, even if they are not evaluated.

And rest of the section is an interesting read.

An interesting topic related to "default" arguments (not related to this topic though):

  • Default argument in the middle of parameter list?
Thursday, June 3, 2021
answered 7 Months ago

You want to look into the Nullable<T> value type.

Saturday, September 25, 2021
answered 2 Months ago
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