Description:
------------
Right now array_fill() returns false and throws an E_WARNING if its second parameter ($num) is less than 1. This is counter-intuitive. As you know, the purpose of array_fill is to create an array with the given number of elements, all preset to one value. The restriction SHOULD be that $num cannot be less than 0, rather than saying it cannot be less than 1.

Why? Because an array of zero-length is a perfectly valid thing in PHP. I ran into a scenario where I was using array fill and $num was a dynamic value. I would have never expected that PHP would actually throw a warning if I told it to create an empty array. I had to write a wrapper function to accommodate, which is stupid. Just allow me to create an empty array like any reasonable person would expect!

Reproduce code:
---------------
<?php

$array1 = array_fill(0, -1, 1);
$array2 = array_fill(0, 0, 1);
$array3 = array_fill(0, 1, 1);

var_dump($array1);
var_dump($array2);
var_dump($array3);

?>

Expected result:
----------------
bool(false)
array(0) {
}
array(1) {
  [0]=>
  int(1)
}
PHP Warning:  array_fill(): Number of elements must be nonnegative in C:\test.php on line 3


Actual result:
--------------
bool(false)
bool(false)
array(1) {
  [0]=>
  int(1)
}
PHP Warning:  array_fill(): Number of elements must be positive in C:\test.php on line 3
PHP Warning:  array_fill(): Number of elements must be positive in C:\test.php on line 4