FIX php8: Fatal when empty $tmpvat is an empty string #29451
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…ersion to '0' when used in arithmetic operations)
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Issue description
PHP8 throws a TypeError when an empty string is used in basic arithmetic operations, where PHP7 would only issue a warning and silently convert to 0.
In some cases,
$tva_txis an empty string (I don't remember the precise context as it happened to a client several weeks ago).This results in
$tmptvabeing also an empty string and causes a fatal error.