Description:
------------
---
From manual page: http://www.php.net/function.array-slice#refsect1-
function.array-slice-description
---

array array_slice ( array $array , int $offset [, int $length = NULL [, bool 
$preserve_keys = false ]] )

That the default value of the $length parameter is NULL is true only for php 
>=5.2.4

Prior to that version, passing NULL is NOT the same as omitting it.

Check this: http://3v4l.org/gW4pG
Note the difference in output between 5.2.3 and 5.2.4

Only starting from 5.2.4 it is as documented.

This has a TREMENDOUS impact and must be documented with a gigantic red warning.
Instead, it is not even mentioned.


The sentence "If it is omitted, then the sequence will have everything from 
offset up until the end of the array." _is_ correct for all version, but if one 
needs to specify the $preserve_keys parameter without specifying $length, one 
needs to pass the default value (that's why it's very relevant), and the value 
has changed.