php实现阿拉伯数字和罗马数字相互转换的方法

本文实例讲述了php实现阿拉伯数字罗马数字相互转换的方法。分享给大家供大家参考。具体如下:

  <?php  // Function that calculates the roman string to the given number:  function dec2roman($f)  {   // Return false if either $f is not a real number,    //$f is bigger than 3999 or $f is lower or equal to 0:      if(!is_numeric($f) || $f > 3999 || $f <= 0) return false;   // Define the roman figures:    $roman = array(    'M' => 1000,    'D' => 500,    'C' => 100,    'L' => 50,    'X' => 10,    'V' => 5,    'I' => 1    );   // Calculate the needed roman figures:    foreach($roman as $k => $v)    if(($amount[$k] = floor($f / $v)) > 0)    $f -= $amount[$k] * $v;   // Build the string:    $return = '';    foreach($amount as $k => $v)    {     $return .= $v <= 3 ? str_repeat($k, $v) : $k . $old_k;     $old_k = $k;      }   // Replace some spacial cases and return the string:    return str_replace(array('VIV','LXL','DCD'),array('IX','XC','CM'),$return);  }  // echo dec2romen(1981);  // Function to get the decimal value of a roman string:  function roman2dec($str = '')  {   // Return false if not at least one letter is in the string:    if(is_numeric($str)) return false;   // Define the roman figures:    $roman = array(    'M' => 1000,    'D' => 500,    'C' => 100,    'L' => 50,    'X' => 10,    'V' => 5,    'I' => 1    );   // Convert the string to an array of roman values:    for($i = 0; $i < strlen($str); $i++)     if(isset($roman[strtoupper($str[$i])]))    $values[] = $roman[strtoupper($str[$i])];   // Calculate the sum of that array:    $sum = 0;    while($current = current($values))    {     $next = next($values);     $next > $current ? $sum += $next - $current + 0 * next($values) : $sum += $current;    }   // Return the value:    return $sum;  }  // echo roman2dec(IX);    ?>

希望本文所述对大家的php程序设计有所帮助。

php实现阿拉伯数字和罗马数字相互转换的方法

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