<?php
print pack("H4", "4142"); // this prints "AB"
?>
So I do
<?php
$foo = unpack("H4", "AB");
?>
But, it appeared that
<b>Fatal error</b>:  pack type H: not enough input, need 4, have 2 in <b>-</b> on line <b>2</b><br>

I can this by using bin2hex function to do this.
But Perl works without error,
is this right unpack() behavior?

Thank you.
Akihiro SAGAWA