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Request #5889 pack() does not take arrays
Submitted: 2000-08-01 09:51 UTC Modified: 2014-04-11 17:31 UTC
Avg. Score:4.3 ± 1.0
Reproduced:18 of 18 (100.0%)
Same Version:3 (16.7%)
Same OS:7 (38.9%)
From: tomwk at audiogalaxy dot com Assigned:
Status: Wont fix Package: *General Issues
PHP Version: 4.0.1pl2 OS: Redhat Linux
Private report: No CVE-ID: None
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From: tomwk at audiogalaxy dot com
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 [2000-08-01 09:51 UTC] tomwk at audiogalaxy dot com
I have an application that writes data across our network
to another program.  Most of the data consists of integer arrays.  I'm currently doing this in a very simple manner,
using something like this:

for( $i = 0; $i < $numInts; $i++ ) {
  fwrite( $fd, pack( "N", $ints[ $i ] ) );

However, this results in a very large number of calls to 
fwrite, which is bad for performance.  I made the routine
about 3 times faster by doing something like this:

fwrite( $fd, pack( "N10" 
  $ints[ $i + 0 ],
  $ints[ $i + 1 ],
  $ints[ $i + 2 ], ///.. and so on, 

However, it would be really great if pack could take an array as one of it's arguments.  I believe this is the way 
Perl behaves, but when I try:

$data = array( 10, 123 );
$buf = pack( "N*", $data );

$valArray = unpack( "N*", $buf );

while( list( $key, $val ) = each( $valArray ) ) {
    echo "$key -> $val\n";

the only output I get is:

1 -> 1


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 [2000-08-01 10:22 UTC]
Well, functions args work differently in perl and PHP. Maybe we need some "array" type of pack modifier, because PHP does not convert function arguments to array. Though, you can write a wrapper function using func_get_args() and func_num_args() for this.
 [2004-06-14 10:49 UTC]
This will not be implemented.
 [2011-03-22 19:00 UTC] joshua at gmail dot com
Yes, it WILL be implemented
 [2014-04-11 13:31 UTC] asakurastar at hotmail dot com
When will it be implemented??
 [2014-04-11 17:31 UTC]
-Package: Feature/Change Request +Package: *General Issues
 [2014-04-11 17:31 UTC]
It won't be as described (passing arrays) because there are other ways of doing it.

PHP 5.6+ introduces argument unpacking.
$buf = pack("N*", ...$data)

PHP <5.6 can use call_user_func_array().
$buf = call_user_func_array("pack", array_merge(array("N*"), $data));
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