Replace an element in array

Hello,
I have two arrays
$keyword= array() //actually this is a word, that you must guess letter by
letter
and
for ($i = 0; $i < count($keyword); $i++) { //make equal word and keys array
length
$keys[] = '*';
if my word is 'foobar' , keys array will show ******
so i want to input a letter and if it exists in the word, to add and replace
in $keys array.
for instance, input 'o' >>*oo***

the code i tried
$findme = $this->data['Word']['find'];
$keyword = str_split($word[0]);
for ($i = 0; $i < count($keyword); $i++) {
$keys[] = '*';
}
$this->set('keys', $keys);
if (in_array($findme, $keyword)) {
$pos = strpos($word[0], $findme);
$replace = str_replace($keys, $pos,$findme);

$new_word = array_push($keyword, $findme); //searches a string in array
$pos = strpos($word[0], $findme);
$key[$pos] = $findme; //finds a character pos in string
}
actually it deals with php functions, that i don't get, will anyone help?
sorry for bad explanation and code, i need this as soon as possible :)
thanks



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