Description:
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From manual page: http://www.php.net/function.unpack#refsect1-function.unpack-notes
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A paragraph in the documentation for unpack says:

>Be aware that if you do not name an element, an empty string is used. If you do not name more than one element, this means that some data is overwritten as the keys are the same such as in: 

It is not correct that an empty string is used. The index 1 is used.

var_dump(unpack('V', 'abcd'));

array(1) {
  [1]=>
  int(1684234849)
}

(It could not be inferred that the documentation means an empty string with "1" appended, because the number is not appended to a lone entry's name:)

var_dump(unpack('Vname', 'abcd'));

array(1) {
  ["name"]=>
  int(1684234849)
}

Here's a clearer way to write it:

>If you do not name an element, numeric indices starting from 1 are used. Be aware that if you have more than one unnamed element, some data is overwritten because the numbering restarts from 1 for each element.