<?php

$kek = array(
	array("1a","2a","3a","4a","5a","6a"),
	array("1a","2a","3a","4a","5a","6a"),
	array("1a","2a","3a","4a","5a","6a"),
);


$final = [];
foreach ($kek as $shrek) {
	foreach ($shrek as &$val) {
		$val .= "b";
	}
	//var_dump($shrek);
	
	foreach($shrek as $shit) {
		$final[] = $shit;
	}
	
}
var_dump($final);