<?php

function numberToChinese($number) {

$digits = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九'];

$tens = ['', '十', '百', '千'];

$bigNumbers = ['', '万', '亿', '兆'];

if ($number == 0) {

return '零';

}

$negative = $number < 0 ? '负' : '';

$number = abs($number);

$parts = [];

$partIndex = 0;

while ($number > 0) {

$part = '';

$currentPart = $number % 10000;

$number = intdiv($number, 10000);

if ($currentPart > 0) {

$tempPart = '';

$digitIndex = 0;

while ($currentPart > 0) {

$digit = $currentPart % 10;

if ($digit > 0) {

$tempPart = $digits[$digit] . ($digitIndex > 0 ? $tens[$digitIndex] : '') . $tempPart;

} else if (strlen($tempPart) > 0 && !str_ends_with($tempPart, '零')) {

$tempPart = '零' . $tempPart;

}

$currentPart = intdiv($currentPart, 10);

$digitIndex++;

}

$part = $tempPart . $bigNumbers[$partIndex];

}

if ($part != '') {

array_unshift($parts, $part);

}

$partIndex++;

}

return $negative . implode('', $parts);

}