PHP function to convert numbers into RMB capital letters_PHP tutorial

/**
* Convert RMB from lower case to upper case
*
* @param string $number value
* @param string $int_unit currency unit, the default is "yuan", some requirements may be "yuan"
* @param bool $is_round whether to round decimals
* @param bool $is_extra_zero Whether to end the integer part with 0 and add 0 to the number where the decimal exists, such as 1960.30
* @return string
​*/
function rmb_format($money = 0, $int_unit = '元', $is_round = true, $is_extra_zero = false) {
//Cut the number into two segments
$parts = explode ( '.', $money, 2 );
$int = isset ( $parts [0] ) ? strval ( $parts [0] ) : '0';
$dec = isset ( $parts [1] ) ? strval ( $parts [1] ) : '';

// If there are more than 2 digits after the decimal point, just truncate without rounding, otherwise process
$dec_len = strlen ( $dec );
If (isset ( $parts [1] ) && $dec_len > 2) {
$dec = $is_round ? substr ( strrchr ( strval ( round ( floatval ( "0." . $dec ), 2 ) ), '.' ), 1 ) : substr ( $parts [1], 0, 2 );
}

// When number is 0.001, the amount after the decimal point is 0 yuan
If (empty ( $int ) && empty ( $dec )) {
          return 'zero';
}

// Definition
$chs = array ('0', '一', '二', '三', '四', '五', 'LU', '旒', '捌', '玖' );
$uni = array ('', '十', 'hundred', 'qian' );
$dec_uni = array ('angle', 'cent' );
$exp = array ('', '万' );
$res = '';

// Search the integer part from right to left
for($i = strlen ( $int ) - 1, $k = 0; $i >= 0; $k ++) {
          $str = '';
                         // According to Chinese reading and writing habits, every 4 characters are converted into a paragraph, and the i is constantly decreasing
for($j = 0; $j < 4 && $i >= 0; $j ++, $i --) {
                  $u = $int {$i} > 0 ? $uni [$j] : ''; // Add units after non-0 numbers
$str = $chs [$int {$i}] . $u . $str;
        }
           $str = rtrim ( $str, '0' ); // Remove the trailing 0
          $str = preg_replace ( "/0+/", "zero", $str ); // Replace multiple consecutive 0s
If (! isset ( $exp [$k] )) {
                $exp [$k] = $exp [$k - 2] . 'Billion'; // Construction unit
        }
           $u2 = $str != '' ? $exp [$k] : '';
$res = $str . $u2 . $res;
}

// If the decimal part is 00 after processing, it needs to be processed
$dec = rtrim ( $dec, '0' );
var_dump ( $dec );
// Find the decimal part from left to right
If (! empty ( $dec )) {
          $res .= $int_unit;

// Whether to add 0 at the number of numbers at the integer part at the end of 0. Some systems have this requirement
If ($is_extra_zero) {
If (substr ( $int, - 1 ) === '0') {
                    $res .= 'zero';
            }
        }

for($i = 0, $cnt = strlen ($dec); $i < $cnt; $i ++) {                    $u = $dec {$i} > 0 ? $dec_uni [$i] : ''; // Add units after non-0 numbers
                $res .= $chs [$dec {$i}] . $u;
                 if ($cnt == 1)
$ Res. = 'Tong';
       }

           $res = rtrim ( $res, '0' ); // Remove the trailing 0
          $res = preg_replace ( "/0+/", "zero", $res ); // Replace multiple consecutive 0s
} else {
           $res .= $int_unit . 'whole';
}
Return $res;
}

$yuan=13598.3;
$ret=rmb_format($yuan);