PHP, reading 8 byte integers from a MySQL database? - php

Question

I have a BINARY(40) column in a MySQL and there I store 5 8 byte integers. I am trying to read those numbers in PHP one by one:
$result = mysqli_query($con,"SELECT data FROM list WHERE id=".$id);
$mysql_array = mysqli_fetch_array($result);
$list = str_split($mysql_array["data"], 8);
for($i = 0; $i < 5; $i++)
echo $list[$i]."<br/>";
Instead of the numbers I expect, weird symbols are printed. How can I convert those numbers from binary strings to integers?

Answer 1

Change your query as follows:
$result = mysqli_query($con,"SELECT cast(data as char(40)) FROM list WHERE id=".$id);

Answer 2

OK, because of the way you're storing the numbers, this code will only work if you've got 64 bit support, otherwise you'll have to look at a bc replacement, shouldn't be too difficult:
for($i = 0; $i < 5; $i++) {
$bin_str = $list[$i];
$int_val = 0;
for ($j = 0; $j < 8; ++$j) {
$byte_val = ord(substr($bin_str, $j, 1));
// push the next byte onto our integer:
$int_val = ($int_val << 8) + $byte_val;
}
echo $int_val;
}
EDIT: In all likelyhood this is a BC equiv, I'm unable to test it at the moment though, however the logic remains unchanged.
for($i = 0; $i < 5; $i++) {
$bin_str = $list[$i];
$bc_val = '0';
for ($j = 0; $j < 8; ++$j) {
$byte_val = ord(substr($bin_str, $j, 1));
// push the next byte onto our integer:
$bc_val = bcadd(bcmul($bc_val, 256, 0), "$byte_val", 0);
}
echo $bc_val;
}