PHP: [number_forma] floating with decimal, with safe zero

_number_format.php

<?php

public function _number_format($number, $bs = '', $decimal = 0)
    {
        if (($e = strrchr($number, 'E')) === false) {
            $len = strlen(substr(strstr($number, '.'), 1));
        }
        else {
            $len = -intval(substr($e, 1));
        }
        $number = rtrim(sprintf('%.'.$len.'F', $number), '0');
        $dec = 0;
        if (strcmp($number + 0, (int) $number) != 0) {
            $dec = 2;
            preg_match("/\d+\.(0+|)\d\d/", $number, $m);
            if ($m) {
                $dec = strlen($m[1]) + $dec;
            }
            $dec = ($decimal > 0) ? $decimal : $dec;
        }
        $arr = explode(',', number_format($number, $dec, '.', $bs));
        return (isset($arr[1])) ? rtrim($arr[0].','.rtrim($arr[1], '0'), ',') : $arr[0];
    }

/* Print results
0.000000000012 -> 0.00000000001
1.123456789015 -> 1.12
1.000100000533 -> 1.00010
1.00000000000000533 -> 1.0000000000000053
1.000000000000000001 -> 1
1.00000000000000001 -> 1
1001.0000000000001 -> 1001.0000000000001
1001.00000000000000001 -> 1001
1.0000000000000000000000000000 -> 1
100056789.1235 -> 100056789.12
1 -> 1
1.0 -> 1
1.00 -> 1
0.001 -> 0.001
0.000000000001 -> 0.000000000001
*/
/*
php -v
PHP 7.1.12 (cli) (built: Dec  1 2017 13:53:12) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
*/
/*
php -i | grep precision
precision => 17 => 17
serialize_precision => -1 => -1
*/