Conversion of numerical amount into capital figures in PHP

Preface

Sometimes it is necessary to convert the numerical amount to the amount in Chinese characters , Although there are many ways online , But most of them are chaotic , Here is one that is now in use 、 It feels good .

    /** *  Convert numerical amount into capital figures  * @param [float] $num  Numeric type  * @return void */
    function convert_case_number($num)
    {
    
        // Convert number types 
        $num = (float) $num;
        // Judge $num Whether there is 
        if (!$num) {
    
            return ' Zero circle ';
        }
        // Keep two decimal places 
        $num = sprintf("%.2f", $num);
        // Convert floating point to integer 
        $tem_num = $num * 100;
        // Judge the length of the number 
        $tem_num_len = strlen($tem_num);
        if ($tem_num_len > 14) {
    
            return ' The number is too big ';
        }
        // Capital numbers 
        $dint = array(' zero ', ' one ', ' Ii. ', ' 3 ', ' boss ', ' wu ', ' lu ', ' Retailer, ', '  ', ' nine ');
        // Amount unit in words 
        $danwei = array(' Thousand ', ' Bai ', ' Ten ', ' Billion ', ' Thousand ', ' Bai ', ' Ten ', ' ten thousand ', ' Thousand ', ' Bai ', ' Ten ', ' round ');
        $danwei1 = array(' horn ', ' branch ');
        // Empty variables are used to save the conversion string 
        $daxie = '';
        // Split numbers , Distinguish rounded corners 
        list($left_num, $right_num) = explode('.', $num);
        // Calculate the unit length 
        $danwei_len = count($danwei);
        // Calculate the length of the split string 
        $left_num_len = strlen($left_num);
        $right_num_len = strlen($right_num);
        // Cycle calculation of billions of yuan, etc 
        for ($i = 0; $i < $left_num_len; $i++) {
    
            // Loop single text 
            $key_ = substr($left_num, $i, 1);
            // The judgment number is not equal to 0 Or a number equal to 0 And the amount unit is 100 million 、 ten thousand 、 round , Just return the string of complete units 
            if ($key_ !== '0' || ($key_ == '0' && ($danwei[$danwei_len - $left_num_len + $i] == ' Billion ' || $danwei[$danwei_len - $left_num_len + $i] == ' ten thousand ' || $danwei[$danwei_len - $left_num_len + $i] == ' round '))) {
    
                $daxie = $daxie . $dint[$key_] . $danwei[$danwei_len - $left_num_len + $i];
            } else {
    
                // Otherwise, the unit is not included 
                $daxie = $daxie . $dint[$key_];
            }
        }
        // Circularly calculate angular minutes 
        for ($i = 0; $i < $right_num_len; $i++) {
    
            $key_ = substr($right_num, $i, 1);
            if ($key_ > 0) {
    
                $daxie = $daxie . $dint[$key_] . $danwei1[$i];
            }
        }

        // Calculate the converted length 
        $daxie_len = strlen($daxie);
        // Set the text slice from 0 Start ,utf-8 Chinese characters account for 3 Characters 
        $j = 0;
        while ($daxie_len > 0) {
    
            // Slice two Chinese characters each time 
            $str = substr($daxie, $j, 6);
            // Judge that the text after slicing is not equal to ten thousand 、 Zero circle 、 zero 、 zero zero 
            if ($str == ' zero ' || $str == ' Zero circle ' || $str == ' zero ' || $str == ' zero zero ') {
    
                // Slice again 
                $left = substr($daxie, 0, $j);
                $right = substr($daxie, $j + 3);
                $daxie = $left . $right;
            }
            $j += 3;
            $daxie_len -= 3;
        }
        return $daxie . ' whole ';
    }

for example ： A lowercase letter ：172190.20 element convert to Capitalization ： One hundred seventy-two thousand one hundred ninety yuan and twenty cents