- var_dump: documentation ( source)
- filter_var: documentation ( source)
- round: documentation ( source)
<?php
var_dump(filter_var('-0', FILTER_VALIDATE_INT));
var_dump(filter_var('-0', FILTER_VALIDATE_FLOAT));
var_dump(is_int(-0));
var_dump(is_float(-0));
var_dump(round(-0.1));
var_dump(is_float(round(-0.1)));
var_dump(-0);