You could use the splice function:
splice @a, 0, 1;
#          |  |
#          |  +-- length
#          +----- offset
#

[download]

Type perldoc -f splice on the command-line to get help on the splice function.

To delete an element based on the value...
for (0..$#a) {
  if ($a[$_] eq 'a') {
    splice @a, $_, 1;
    last; # exit the for loop because only want to delete
          # the first match
  }
}

[download]

If you want to remove all occurance of an element, it's actually easier:
@a = map { /a/ ? () : $_ } @a;

[download]

In reply to Re: Array element deletion by Roger
in thread Array element deletion by Anonymous Monk

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