Total 21, divided into 5 parts, each output 5 article how to write

Total 21, divided into 5 parts, each output 5 article how to write
I use PHP to make templates
Total call 21 headings into 5 copies of the output, each part of the style is different, how to judge how to write?
--------The general effect is as follows-----------

A H2 title

Show 5 titles Show 5 headings

Show 5 titles Show 5 headings
--------approximate effect as above-----------
Please give the code

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------Solution--------------------
Test code

Analog data
$ar = Range (1, 21);
Cut as required
$t = Array_merge (
  Array (Array (Array_shift ($ar)))//First Data
  , Array_chunk ($ar, COUNT ($ar)/4)//remaining divided into 4 points
);
Output
foreach ($t as $i = = $r) {
  echo "". Join ('
', $r). "\ n";
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21st

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