Description:
------------
I'm removing a few notes from max() docs because I think some of it's 
content should be added to docs.

Note #87547 from sumeruter+php add an at gmail dot com:
"An interesting feature not mentioned is that if a recursive array is 
passed to max, max will return the sub-array containing the highest 
value.

Example:
<?php
$depth3=array(
  array(array(1,6,3),array(7,2,5),array(9,3,0)),
  array(array(2,1,8),array(4,4,5),array(  99  ,6,7)),
  array(array(0,3,2),array(5,91,11),array(42,25,12)));

$depth2=max($depth3);
// = array(array(2,1,8),array(4,4,5),array(  99  ,6,7))

$depth1=max($depth2);
// = array(  99  ,6,7)

$depth0=max($depth1);
// = 99

echo max(max(max($depth3)));
// echo 99;
?>"

Note #92073 from soapergem at gmail dot com: 
A quick addendum to the comment left by "sumeruter": the recursive 
property will only work if all the sub-arrays are exactly the same 
length. Otherwise it will just return the longest array every time.

Note #95367 from vendelin8 at gmail dot com:
I disagree with sumeruter that in case of a recursive array php 
returnes the sub-array containing the highest value recursively. It 
checks the first value.
Eg.

$array = array(array(2, 3, 4), array(1, 4, 5));
print_r(max($array));

result:
Array ( [0] => 2 [1] => 3 [2] => 4 )

In sumeruter's example the maximal value was always in the array that 
has the highest first value as well.

Expected result:
----------------
This is the example of information I think should be added in docs:

When a multi-dimensional array is given, this function returns the sub-
array with highest first value.

In order to copare multi-dimensional arrays, they should have the exact 
same size. (I could not test to ensure this behavior tho)