PHP function to convert numerical amounts into Chinese capital amounts

/**
 *Function to convert numeric amounts into Chinese uppercase amounts
 *String Int $num Lowercase numbers or lowercase strings to be converted
 *return uppercase letters
 *Two decimal places
 **/
 function get_amount($num){
 $c1 = "zero one two three four five land seven hundred and eighty nine";
 $c2 = "cents one hundred thousand ten thousand Hundreds of billions";
 $num = round($num, 2);
 $num = $num * 100;
 if (strlen($num) > 10) {
 return "The data is too long, not so big Money, check it out";
 }
 $i = 0;
 $c = "";
 while (1) {
 if ($i == 0) {
 $n = substr($num, strlen($ num)-1, 1);
 } else {
 $n = $num % 10;
 }
 $p1 = substr($c1, 3 * $n, 3);
 $p2 = substr($c2, 3 * $i, 3);
 if ($n != '0' || ($n == '0' && ($p2 == '100 million' || $p2 == '10,000' || $p2 = = '元'))) {
 $c = $p1 . $p2 . $c;
 } else {
 $c = $p1 . $c;
 }
 $i = $i + 1;
 $num = $num / 10;
 $num = (int)$num;
 if ($num == 0) {
 break;
 }
 }
 $j = 0;
 $slen = strlen($c);
 while ($j < $slen) {
 $m = substr($c, $j, 6);
 if ($m == 'zero yuan' || $m == 'zero thousand' || $m = = '000 million' || $m == '000') {
 $left = substr($c, 0, $j);
 $right = substr($c, $j + 3);
 $c = $left . $right;
 $j = $j-3;
 $slen = $slen-3;
 }
 $j = $j + 3;
 }

 if (substr($c, strlen($ c)-3, 3) == 'zero') {
 $c = substr($c, 0, strlen($c)-3);
 }
 if (empty($c)) {
 return "zero Yuan Zheng";
 }else{
 return $c . "Zheng";
 }
 }

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