number_format() in php vs toFixed() in jQuery for validation

Question

I am having some data calculation on my client side, which I want to validate on the server end. Let's say my calculated value result is 34.55

(34.55).toFixed(1) gives me 34.5

Strangely, (34.555).toFixed(1) gives me 34.6

number_format(34.55, 1, '.', '') gives me 34.6

Can anyone suggest me an exact equivalent of either of the functions?

Answer 1

round(1.95583, 2);  // 1.96

round( 1.55, 1, PHP_ROUND_HALF_DOWN); //  1.5

round( 1.54, 1, PHP_ROUND_HALF_DOWN); //  1.5

round( 1.55, 1, PHP_ROUND_HALF_EVEN); //  1.6

round( 1.54, 1, PHP_ROUND_HALF_EVEN); //  1.5

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