PHP 7.1 'Non-Numeric Value' Warning: How Can I Troubleshoot Line 29 Errors?

"Line 29 Dilemma: Warning of Non-Numeric Value in PHP 7.1"

Facing the "Warning: A non-numeric value encountered" error upon upgrading to PHP 7.1 can be puzzling. This error is typically triggered when performing arithmetic operations involving non-numeric values.

One common scenario where this issue arises is with lines like:

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

Ensure that both $item['quantity'] and $product['price'] contain numeric values. If any of these values is non-numeric, such as an empty string, you will encounter this error.

However, the issue you're facing may not be directly related to the provided code. The answer suggests that the error you faced (non-numeric value) in PHP 7.1 was caused by mistakenly using for string concatenation instead of .. While this is not directly the issue described in your question, it does highlight the importance of using the correct operators for the correct data types to avoid this error.

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