php将任意进制数转换成10进制的方法

本文实例讲述了php实现将任意进制数转换成10进制的方法。分享给大家供大家参考。具体如下：

php将任意进制的数转换成10进制，例如8进制转换成10进制，16进制转换成10进制

 ?php# Show the steps involved in converting a number # from any base (like octal or hex) to base 10# See below for examples, instructions and copyrightfunction show_convert_to_base_10 ($number, $base) // If the number contains a decimal component if (strstr ($number, . )) // Get the integer and decimal components list ($integer, $decimal) = explode ( . , $number); else // The number is an integer $integer = $number; print b Convert the base $base number $number to a base 10 number: /b blockquote  print Convert the integer component ($integer) of the number: blockquote  // Compute the html' target='_blank'>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): br/  print $digit * $base sup $pos /sup = $result br/ br/  $sums[] = $result; print /blockquote  if (isset ($decimal)) print Convert the decimal component (0.$decimal) of the number: blockquote  // 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): br/  print $digit * 1/$base sup $pos /sup = $result br/ br/  $sums[] = $result; print /blockquote  $sums = implode ( + , $sums); eval ( /$base_10_value = $sums;  print /blockquote The value of the base $base number $number in base 10 is $base_10_value. br/  print This number is derived from the sum of the values of the previous operations ($sums). br/ br/ }

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