<?php
$data=[
["id"=>"1", "words"=>"words 1"],
["id"=>"2", "words"=>"words 2"],
["id"=>"3", "words"=>"words 3"],
["id"=>"4", "words"=>"words 4"],
["id"=>"5", "words"=>"words 5"],
["id"=>"6", "words"=>"words 6"],
["id"=>"7", "words"=>"words 7"],
["id"=>"8", "words"=>"words 8"],
["id"=>"9", "words"=>"words 9"],
["id"=>"10", "words"=>"words 10"]
];
shuffle($data);
print_r(array_chunk($data, 3));