Problema nu e la
intval, ci la inmultire. Explicatia pe larg, direct din manual, floating point numbers:
[…] rational numbers that are exactly representable as floating point numbers in base 10, like 0.1 or 0.7, do not have an exact representation as floating point numbers in base 2, which is used internally, no matter the size of the mantissa. Hence, they cannot be converted into their internal binary counterparts without a small loss of precision. This can lead to confusing results: for example,
floor((0.1+0.7)*10) will usually return
7 instead of the expected
8, since the internal representation will be something like
So never trust floating number results to the last digit, and do not compare floating point numbers directly for equality.
Ca o paranteza, nu folositi niciodata operatorii aritmetici atunci cand lucrati cu valori numerice importante, gen bani. Folositi extensia BC Math. E cam peste mana sa scrii
bcmul($val, 100) in loc de
$val * 100, dar asta e situatia.