How to construct and write a byte to a binary file in PHP

Question

I'm trying to write a byte in binary to a file.

I have the binary byte (8 bits) as a string, e.g. "01100101"

How do I write this as one byte in PHP? When I fopen with "wb" it still writes it in ASCII and puts 01100101 in a file. I might be confused how how the whole process works..

Possible duplicate of Write binary file in PHP

jww
– jww

2019-05-16 03:22:21 +00:00
Commented May 16, 2019 at 3:22 — jww
– jww, Commented May 16, 2019 at 3:22

Ry- · Accepted Answer · 2012-04-29 00:59:46Z

3

I think pack() is what you're looking for.

function bin2bstr($input)
// Convert a binary expression (e.g., "100111") into a binary-string
{
    if (!is_string($input)) return null; // Sanity check

    // Pack into a string
    return pack('H*', base_convert($input, 2, 16));
}

edited Apr 29, 2012 at 0:59

Ry-♦

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answered Apr 29, 2012 at 0:56

Griffin

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1 Comment

TecBrat Over a year ago

Just commenting here to help me find this later. :-)

Joop Eggen · Accepted Answer · 2012-04-29 00:59:28Z

0

$number = bindec("01100101");

$number = 0b01100101; // better

The notation 0b... is for binary numbers.

answered Apr 29, 2012 at 0:59

Joop Eggen

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Comments

javad shariaty · Accepted Answer · 2015-12-17 13:45:00Z

0

file_put_contents('aa',pack('ifA5',1001,25.5,'asdfg'));
var_dump(unpack('iint/ffloat/A5lkl',file_get_contents('aa')));

answered Dec 17, 2015 at 13:45

javad shariaty

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