Answer by Berserk for Round DOWN to nearest half integer in PHP

A easy solution is to use modulo operator (fmod() function), like this :

function roundDown($number, $nearest){    return $number - fmod($number, $nearest);}var_dump(roundDown(7.778, 0.5));var_dump(roundDown(7.501, 0.5));var_dump(roundDown(7.49, 0.5));var_dump(roundDown(7.1, 0.5));

And the result :

The advantage it's that work with any nearest number (0.75, 22.5, 3.14 ...)

You can use the same operator to roundUp :

function roundUp($number, $nearest){    return $number + ($nearest - fmod($number, $nearest));}var_dump(roundUp(7.778, 0.5));var_dump(roundUp(7.501, 0.5));var_dump(roundUp(7.49, 0.5));var_dump(roundUp(7.1, 0.5));