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Manual: base_convert
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  atan2
  Updated
Sat, 12 Aug 2000
 bindec 
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base_convert

(PHP3 >= 3.0.6, PHP4 )

base_convert -- Convert a number between arbitrary bases

Description

strin base_convert (string number, int frombase, int tobase)

Returns a string containing number represented in base tobase. The base in which number is given is specified in frombase. Both frombase and tobase have to be between 2 and 36, inclusive. Digits in numbers with a base higher than 10 will be represented with the letters a-z, with a meaning 10, b meaning 11 and z meaning 36.

Example 1. Base_convert()


$binary = base_convert ($hexadecimal, 16, 2);


User Contributed Notes: base_convert

scott@mha.ca
08-Sep-1999 03:48
This would seem to be limited to 31 bits, ie. the range of values that can be converted is 0 - 2147483647 in decimal.

Also, this will convert negative values to positive values, unlike DecHex() which will return a null string for negative values.

From what I have observed (using PHP 3.0.11) the following statements will set both a and c to a null string and set b to positive 1.

$a = base_convert (2147483648, 10, 16);
$b = base_convert (-1, 10, 16);
$c = dechex (-1);



tim_converse@yahoo.com
19-Jan-2000 03:05
The explanation says that "z means 36" when it should read "z means 35" (the highest single-digit number in base 36).



tim_converse@yahoo.com
19-Jan-2000 03:24
base_convert expects its string arguments to be integral, and gives nonsensical answers when given floating-point strings. For example, base_convert("1.0", 10, 2) yields "1100100". It seems that "1.0" is being interpreted as "100". (PHP4.0b3).

 About Notes

Previous page
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  Updated
Sat, 12 Aug 2000
 bindec 
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