Append a value to an array ELEMENT

$cats=array($cat1, $cat2, $cat3, $cat4, $cat5);

foreach($category as $index => $value)
{
	if(in_array($index, $cats))
	{
		$output[]= '<a href="/directory/'.$index.'/">'.$value[2].'</a>';
		
		foreach($subcats as $index1 => $value1)
		{
			if($value1[0] == $index)
			{
				$output[]= $value1[2];
			}
		}
	}
}

$output = implode(' | ',$output);
echo $output;

Code (markup):

I want the INNER foreach loop to append it's value to the current element of the $output[] array, rather than adding a new element.

 

Basically what I'm trying to acheive is to not have the 'pipe' symbol appear when the inner foreach loop is run - if I can get the value appended to the current element of the array then it isn't going to display it.

 

$cats=array($cat1, $cat2, $cat3, $cat4, $cat5);
$i = 0;
foreach($category as $index => $value)
{
	if(in_array($index, $cats))
	{
		$output[$i]= '<a href="/directory/'.$index.'/">'.$value[2].'</a>';
		
		foreach($subcats as $index1 => $value1)
		{
			if($value1[0] == $index)
			{
				$output[$i] .= $value1[2];
			}
		}
        $i++;
	}
}

$output = implode(' | ',$output);
echo $output;

PHP:

 

Thanks shoro, that works perfect