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String Compression: Write a PHP function to compress a given string by replacing repeated characters with their counts.

function compressString($str) {
    return preg_replace_callback('/(.)*/', function($match) {
        return $match[1] . strlen($match[0]);
    }, $str);
}

// Example usage:
$string = "aaabbbcccc";
echo "Compressed string: " . compressString($string);

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