php read data from binary file

Question

i cant find the answer for my problem. i had the code

$arr = array(pack("d",1324),pack("d",151),pack("d",8564));
file_put_contents('C:\\Users\\Duc Nguyen\\Desktop\\text.bin', $arr);

so i got a binary file. i used the code

$s = file_get_contents('C:\\Users\\Duc Nguyen\\Desktop\\text.bin');
foreach(unpack("d", $s) as $n) 
    echo $n;

to read it but it didnt work.can you show me how i can read the data from the file. i prefer not to use the serialize/unserialize function. thank you!

didnt work What does that mean? Your code works fine for me. — Rizier123
– Rizier123, Commented Feb 21, 2015 at 16:39

Rizier123 · Accepted Answer · 2015-02-21 17:24:21Z

1

You just used the wrong format for pack() and unpack(), just change d to d*. E.g:

$arr = array(pack("d*",1324),pack("d*",151),pack("d*",8564));
//...            v  ^               ^              ^
foreach(unpack("d*", $s) as $n)

And a quote from the manual:

The repeater argument can be either an integer value or * for repeating to the end of the input data.

answered Feb 21, 2015 at 17:24

Rizier123

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1 Comment

Duc Nguyen Over a year ago

oh right. i should have read the manual carefully. thank you very much

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