<?php
$array_1 = array_map(function($n) { return round($n, 1); }, range(1, 1.9, 0.1));
var_dump(in_array(1.7, $array_1));
$array_2 = array_map(function($n) { return round($n, 1); }, range(0, 0.9, 0.1));
var_dump(in_array(0.3, $array_2));
var_dump(in_array(0.6, $array_2));
var_dump(in_array(0.7, $array_2));
//=>it return false;
preferences:
57.5 ms | 402 KiB | 5 Q