How to write "pseudo" binary into file using php?

Question

I have a string containing something like "01001010" and I want to write it into a file using binary. In other words, what's inside that file is not the chars 0/1, but in binary format. How can I make that?

You mean you want to convert a string of the form $bitString = '01010101...'; into binary data (0x55...), and then write that to a file? — John Carter
– John Carter, Commented Nov 3, 2012 at 3:39
@MarcB but beware that base_convert will fail if you try and handle too many bits at once. — John Carter
– John Carter, Commented Nov 3, 2012 at 3:45
@therefromhere: easy enough to yank out (say) 16 chars at a time from the source string and convert them individually. As long as you convert a byte's worth of characters into bits at a time, there's no danger of running into base_convert's limits. — Marc B
– Marc B, Commented Nov 3, 2012 at 3:48

Community · Accepted Answer · 2017-05-23 12:26:23Z

2

So you mean you want to convert a string of 0s and 1s (eg $bitString = '01010101...';) into binary data (0x55...), and then write that to a file, you need to do this in two steps.

First, convert your string of zeros and ones into binary - see Converting string of 1s and 0s into binary value, then compress afterwards ,PHP

Note that strings in PHP can store binary data.

Then just write the output to a file, eg using file_put_contents().

edited May 23, 2017 at 12:26

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answered Nov 3, 2012 at 3:44

John Carter

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1 Comment

NSF Over a year ago

Nice hint anyway. Thanks. Sorry for the late reply since I almost forgot it :)

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