[WIP] Optimize pack()

[nielsdos]

No description provided.

[staabm]

maybe a interessting benchmark/test-case for unpack: stomp-php/stomp-php#184

<?php
$file = file_get_contents('FILE');
echo count(unpack('C*', $file)) . "\n";

vs.

<?php
$file = file_get_contents('FILE');
echo strlen($file) . "\n";

using truncate -s 80M FILE.

the strlen() variant is a lot faster

[nielsdos]

maybe a interessting benchmark/test-case for unpack: stomp-php/stomp-php#184

<?php
$file = file_get_contents('FILE');
echo count(unpack('C*', $file)) . "\n";

vs.

<?php
$file = file_get_contents('FILE');
echo strlen($file) . "\n";

using truncate -s 80M FILE.

the strlen() variant is a lot faster

Unpack will always be slower than just strlen. However, your code revealed that repetitions were handled in a slow way where lots of temporary strings were created and then parsed. I opened a PR to fix that particular issue: #18803