Rage Quit

<?php

$string = readline();
$countUniqueSymbols = 0;
$stringCountRepeat = 0;
$tempString = '';
$newString = '';
for ($i = 0; $i < strlen($string); $i++) {
    $currentChar = $string[$i];
    if (is_numeric($currentChar) !== true) {
        $tempString .= $currentChar;
    } else {
        if ($i + 1 < strlen($string)) {
            $nextChar = $string[$i + 1];
            if (is_numeric($nextChar)) {
                $currentChar .= $nextChar;
            }
        }
        $stringCountRepeat = intval($currentChar);
        $newString .= str_repeat(strtoupper($tempString), $stringCountRepeat);
        $tempString = '';
    }
}
$rageMessage = array_unique(str_split($newString));
echo "Unique symbols used: " . count($rageMessage) . PHP_EOL;
echo $newString;