PHP使用递归函数将项转换为十六进制

function decimalToHex($number) {
    $hex = '';
    
    // 递归终止条件
    if ($number < 16) {
        switch ($number) {
            case 10:
                $hex = 'A';
                break;
            case 11:
                $hex = 'B';
                break;
            case 12:
                $hex = 'C';
                break;
            case 13:
                $hex = 'D';
                break;
            case 14:
                $hex = 'E';
                break;
            case 15:
                $hex = 'F';
                break;
            default:
                $hex = strval($number);
        }
    } else {
        $remainder = $number % 16;
        $quotient = floor($number / 16);
        
        // 递归调用
        $hex = decimalToHex($quotient) . decimalToHex($remainder);
    }
    
    return $hex;
}

$decimal = 255;
$hexadecimal = decimalToHex($decimal);
echo "十进制数 $decimal 转换为十六进制为 $hexadecimal";