How to combine strings inside foreach into single string PHP

Question

I have code like this

$word = 'foo';
$char_buff = str_split($word);

foreach ($char_buff as $chars){
    echo var_dump($chars);
}

The output was

string(1) "f" 
string(1) "o" 
string(1) "o"

For some reasons, I want to make the output become only 1 string like this:

string(3) "foo"

I tried with this

$char.=$chars;
echo var_dump($char);

But it shows error Undefined variable: char.

Answer 1

I'm going to assume that you have a good reason for splitting it up, only to put it back together again:

$word = 'foo';
$result = "";
$char_buff = str_split($word);

foreach ($char_buff as $char){
    $result .= $char;
}

echo var_dump($result);

Which outputs the following:

string(3) "foo"