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php怎么實現(xiàn)數(shù)值轉(zhuǎn)十進制

本文操作環(huán)境：windows7系統(tǒng)、php7.1版、DELL G3電腦

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php怎么實現(xiàn)數(shù)值轉(zhuǎn)十進制？

php實現(xiàn)將任意進制數(shù)轉(zhuǎn)換成10進制的方法

本文實例講述了php實現(xiàn)將任意進制數(shù)轉(zhuǎn)換成10進制的方法。分享給大家供大家參考。具體如下：

php將任意進制的數(shù)轉(zhuǎn)換成10進制，例如8進制轉(zhuǎn)換成10進制，16進制轉(zhuǎn)換成10進制

Convert the base $base number $number to a
  base 10 number:";
  print "Convert the integer component ($integer) of the
   number:";
 // Compute the value of the integer component
 // Loop through the integer digit by digit
 // Reverse the number for easier handling
 $integer = strrev ($integer);
 $length = strlen ($integer);
 for ($pos = 0; $pos < $length; ++$pos)
 {
  /*
   PHP lets you treat strings and numbers like arrays
   Specify an offset and get the character at that
   position
  */
   $digit = $integer[$pos];
  // Handle character values for digits
  // (for bases greater than 10)
  if (eregi ('[a-z]', $digit))
  {
   $digit_value =
     (ord (strtolower ($digit))
     - ord ('a')) + 10;
    $digit = "$digit ($digit_value)";
  }
  else
  {
   $digit_value = $digit;
  }
  // Multiply the current digit by the radix
  // raised to the power of the current position
  $result = $digit_value * pow ($base, $pos);
   print "Multiply the value of the digit at position
    $pos by the value of the radix ($base) raised
    to the power of the position ($pos):
";
   print "$digit * $base^$pos = $result
    

";
   $sums[] = $result;
 }
 print '';
 if (isset ($decimal))
 {
   print "Convert the decimal component (0.$decimal)
   of the number:";
  // Pad the number with a leading 0 so that we can
  // start at position 1
  $decimal = '0'.$decimal;
  $length = strlen ($decimal);
   for ($pos = 1; $pos < $length; ++$pos) {
   $digit = $decimal[$pos];
   // Handle character values for digits
   // (for bases greater than 10)
   if (eregi ('[a-z]', $digit))
   {
     $digit_value =
     (ord (strtolower ($digit))
     - ord ('a')) + 10;
      $digit = "$digit ($digit_value)";
   }
   else
   {
     $digit_value = $digit;
   }
   // Multiply the current digit by the radix
   // raised to the power of the current position
   $result = $digit_value * pow (1/$base, $pos);
    print "Multiply the value of the digit at
    position $pos by the value of the 1/radix
    ($base) raised to the power of the position
    ($pos):
";
    print "$digit * 1/$base^$pos =
    $result

";
    $sums[] = $result;
  }
  print '';
 }
 $sums = implode (' + ', $sums);
 eval ("\$base_10_value = $sums;");
  print "The value of the base $base number
  $number in base 10 is $base_10_value. 
";
  print "This number is derived from the sum of the values
  of the previous operations ($sums). 
 
";
}

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