Problem_01.php

<?php
function test($input) 
{
	$inputArr = str_split($input);
	
	$result = [];
	array_push($result, [
		'char' => $inputArr[0],
		'count' => 0
	]);
	foreach($inputArr as $char) 
	{
		$last = count($result) - 1;
		if ($result[$last]['char'] == $char) {
			$result[$last]['count']++;
		} else {
			array_push($result, [
				'char' => $char,
				'count' => 1
			]);
		}
	}
	
	$last = count($result) - 1;
	if($result[0]['char'] == $result[$last]['char']) {
		$result[$last]['count'] += $result[0]['count'];
	} else {
		array_push($result, $result[0]);
	}
	array_shift($result);
	
	foreach($result as $item) {
		print($item['char'].$item['count']);
	}
	print(' ');
}

$input = 'bbaabaccchhaa';
test($input);
$input = 'abaccchhaa';
test($input);