decbin

(PHP 4, PHP 5, PHP 7, PHP 8)

decbin — Decimal to binary

Description

decbin(int $num): string

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

Parameters

num

Decimal value to convert

**Range of inputs on 32-bit machines**
positive `num`	negative `num`	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 `num`	negative `num`	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 num

Examples

Example #1 decbin() example

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

The above example will output:

1100
11010

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User Contributed Notes 2 notes

down

rambabusaravanan at gmail dot com ¶

8 years ago

Print as binary format with leading zeros into a variable in one simple statement.

<?php
    $binary = sprintf('%08b',  $decimal);    / $decimal = 5;
    echo $binary;    / $binary = "00000101";
?>