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PHP base_convert() Function
Definition and Usage
The base_convert() function is versatile utility to convert a number with one base to another. The base is not restricted to binary, octal, hexadecimal or decimal. It can be any number between 2 and 36.
First argument to this function is a string that can contain alpha-numeric characters. Digits in a number with base>9 will be represented by alphabets a - z such that 10 is represented by 'a', 11 by 'b' upto 35 by 'z'
For example base_convert('1001', 2,10) converts '1001' from binary to decimal number which is 9
Syntax
base_convert ( string $number , int $frombase , int $tobase ) : string
Parameters
| Sr.No | Parameter & Description |
|---|---|
| 1 | number A string containing the number to be converted |
| 2 | frombase base of representation of number |
| 3 | tobase base to which number needs to be converted to |
Return Values
PHP base_convert() function returns astring that represents the number so converted.
PHP Version
This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.
Example
Following example converts '1001' from binary to decimal number system. −
<?php
$arg='1001';
$frombase = 2;
$tobase = 10;
$val=base_convert($arg,$frombase, $tobase);
echo "base_convert(" . $arg . " from base " . $frombase . "to " . $tobase . ") = " . $val;
?>Output
This will produce following result −
base_convert(1001 from base 2 to 10) = 9
Example
Following example converts '12340' as in a number system 5 to one with 16 −
<?php
$arg='12340';
$frombase = 5;
$tobase = 16;
$val=base_convert($arg,$frombase, $tobase);
echo "base_convert(" . $arg . " from base " . $frombase . "to " . $tobase . ") = " . $val;
?>Output
This will produce following result −
base_convert(12340 from base 5 to 16) = 3ca
Example
Characters other than alphabets (a-z) or digits (0-9) are ignored. In this example, '+' in the number string is ignored. −
<?php
$arg='12+340';
$frombase = 10;
$tobase = 16;
$val=base_convert($arg,$frombase, $tobase);
echo "base_convert(" . $arg . " from base " . $frombase . "to " . $tobase . ") = " . $val;
?>Output
This will produce following result −
base_convert(12+340 from base 10 to 16) = 3034
Example
"CANDLE" is a number with 25 as its base. Following example converts it to Hexadecimal number system
<?php
$arg='CANDLE';
$frombase = 25;
$tobase = 16;
$val=base_convert($arg,$frombase, $tobase);
echo "base_convert(" . $arg . " from base " . $frombase . " to " . $tobase . ") = " . $val;
?>Output
This will produce following result −
base_convert(CANDLE from base 25 to 16) = 73d5c1d
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