/**
* counts frequency of all values from input stream in a private variable
*
* @param StreamInterface $input
* @throws Exception
*/
public function updateFrequencyArray(StreamInterface $input)
{
while (!$input->streamEnded()) {
$char = $input->getChar();
if ($char === false) {
break;
}
if (PHP_INT_MAX == $this->frequencyTotal) {
throw new Exception('the counts in the frequency array are about to exceed ' . PHP_INT_MAX);
}
$this->frequencyTotal++;
if (isset($this->frequency[$char])) {
$this->frequency[$char]++;
} else {
$this->frequency[$char] = 1;
}
}
}
