unpack
(PHP 3, PHP 4 )
unpack -- Unpack data from binary string
Description
array unpack ( string format, string data)
unpack() from binary string into array according to format.
Returns array containing unpacked elements of binary string.
unpack() works slightly different from Perl as the unpacked
data is stored in an associative array. To accomplish this
you have to name the different format codes and separate
them by a slash /. Example 1. unpack() example
<?php
$array = unpack("c2chars/nint", $binarydata);
?>
The resulting array will contain the entries "chars1",
"chars2" and "int".
Caution
Note that PHP internally stores integral values as signed.
If you unpack a large unsigned long and it is of the same
size as PHP internally stored values the result will be
a negative number even though unsigned unpacking was specified.
See also pack() for an explanation of the format codes.
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