<?php
var_dump(encodeFloat(1.1234567890123456, 13));
function encodeFloat($float, $precision)
{
$precision = max(1, (int) $precision);
$log = (int) floor(log(abs($float), 10));
if (abs($float) < 9007199254740992.0 && $log > -5 && abs($log) < $precision) {
return $this->formatFloat($float, $precision - $log - 1);
}
// Deal with overflow that results from rounding
$log += (int) (round(abs($float) / pow(10, $log), $precision - 1) / 10);
$string = $this->formatFloat($float / pow(10, $log), $precision - 1);
return sprintf('%sE%+d', $string, $log);
}
function formatFloat($float, $digits)
{
$digits = max((int) $digits, 1);
$string = rtrim(number_format($float, $digits, '.', ''), '0');
return substr($string, -1) === '.' ? $string . '0' : $string;
}
preferences:
43.46 ms | 402 KiB | 5 Q