this is my best attempt (and my first golf, so please be kind ,): 
sub p {
my($a,$z,@x)=@_;
my @n=($z)x(abs @x-abs $a);
@n=abs $a>@x?$a<0?(@n,@x):(@x,@n):@x;
}

[download]
It passes strict; and warnings;

Update:
slightly optimized(71; less whitespace, stolen tricks ,)
sub p {($a,$b,@x)=@_;@_=($b)x(abs@x-abs$a);@_=abs$a>@x?$a<0?(@_,@x):(@
+x,@_):@x}

[download]
Why can i omit "my" here?

holli, regexed monk

In reply to Re: Golfing Array_Pad by holli
in thread Golfing Array_Pad by BUU

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.