So I am using
filter_var($kcat, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_SCIENTIFIC)."," .
To filter user input. However, scientific notation doesn’t do much good if I can’t use periods. So I tried to change it to:
filter_var($kcat, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_SCIENTIFIC, FILTER_FLAG_ALLOW_FRACTION)."," .
But that just tells me
Warning: filter_var() expects at most 3 parameters, 4 given
So how can I make these filters actually usable?