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PHP

Decimal to binary


decbin

(PHP 4, PHP 5)

decbinDecimal to binary

Description

string decbin ( int $number )

Returns a string containing a binary representation of the given number argument.

Parameters

number

Decimal value to convert

Range of inputs on 32-bit machines
positive number negative number return value
0   0
1   1
2   10
... normal progression ...
2147483646   1111111111111111111111111111110
2147483647 (largest signed integer)   1111111111111111111111111111111 (31 1's)
2147483648 -2147483648 10000000000000000000000000000000
... normal progression ...
4294967294 -2 11111111111111111111111111111110
4294967295 (largest unsigned integer) -1 11111111111111111111111111111111 (32 1's)
Range of inputs on 64-bit machines
positive number negative number return value
0   0
1   1
2   10
... normal progression ...
9223372036854775806   111111111111111111111111111111111111111111111111111111111111110
9223372036854775807 (largest signed integer)   111111111111111111111111111111111111111111111111111111111111111 (63 1's)
  -9223372036854775808 1000000000000000000000000000000000000000000000000000000000000000
... normal progression ...
  -2 1111111111111111111111111111111111111111111111111111111111111110
  -1 1111111111111111111111111111111111111111111111111111111111111111 (64 1's)

Return Values

Binary string representation of number

Examples

Example #1 decbin() example

<?php
echo decbin(12) . "\n";
echo 
decbin(26);
?>

The above example will output:

 1100 11010 

See Also

  • bindec() - Binary to decimal
  • decoct() - Decimal to octal
  • dechex() - Decimal to hexadecimal
  • base_convert() - Convert a number between arbitrary bases
  • printf() - Output a formatted string, using %b, %032b or %064b as the format
  • sprintf(), using %b, %032b or %064b as the format



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