- var_dump: documentation ( source)
- ini_set: documentation ( source)
- json_encode: documentation ( source)
<?php
$k=0.1+0.7;
var_dump($k); //return 0.8
var_dump(0.8 == $k); //return false
$res = (string)$k - json_encode($k);
print($res."\n\n"); //return 1.1102230246252E-16
ini_set('precision', '-1');
$k=0.1+0.7;
var_dump($k); //return 0.7999999999999999
var_dump(0.8 == $k); //return false
$res = (string)$k - json_encode($k);
print($res); //return 0