Why Am I Getting the 'Warning: A Non-Numeric Value Encountered' Error in PHP?

Encountering the "Warning: A Non-Numeric Value Encountered" Error

The error "Warning: A non-numeric value encountered" typically arises during PHP execution, indicating an attempt to perform arithmetic operations on a non-numeric value. This issue often occurs during variable assignments involving concatenation or calculations.

In your specific case, the error occurred on line 29:

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

The issue here may lie with the values stored in either $item['quantity'] or $product['price']. It's essential to ensure that these values are numeric before performing the multiplication operation. You can utilize functions like is_numeric(), intval() or floatval() to validate and convert non-numeric values.

However, as the error in this instance does not align directly with your issue, it's worth exploring an alternative scenario. The error message "A non-numeric value encountered" can also occur when mistakenly using the addition operator ( ), instead of the concatenation operator (.) when merging strings. This can lead to the error, despite the variables being valid numeric values.

To resolve this error effectively, you should always verify the types of the variables involved in any mathematical operations or string manipulations, ensuring that non-numeric values are handled appropriately.

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