function

gistfile1.txt

function searchOne($word,$key,$start = 0)
{
    for($i=$start;$i<strlen($word);$i++)
    {
        if($word[$i] == $key)
        {
            return $i;
        }
    }
    return -1;
}

function searchMulti($word,$key)
{
    $data = [];
    $start = 0;
    while(searchOne($word,$key,$start) > -1)
    {
        $start = searchOne($word,$key,$start);
        $data[] = $start;
        $start = $start +1;
    }
    var_dump($data);
}

searchMulti('muhammet','m');