- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
$float = 0.032;
$not_float = "0.03b2";
var_dump(filter_var($float, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION));
var_dump(filter_var($not_float, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION));
var_dump(filter_var($float, FILTER_VALIDATE_FLOAT));
var_dump(filter_var($not_float, FILTER_VALIDATE_FLOAT));
echo "\n\n"; // Showing without FILTER_FLAG_ALLOW_FRACTION flag
var_dump(filter_var($float, FILTER_SANITIZE_NUMBER_FLOAT));