/usr/share/php/Sabre/VObject/Parameter.php is in php-sabre-vobject 2.1.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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namespace Sabre\VObject;
/**
 * VObject Parameter
 *
 * This class represents a parameter. A parameter is always tied to a property.
 * In the case of:
 *   DTSTART;VALUE=DATE:20101108
 * VALUE=DATE would be the parameter name and value.
 *
 * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Parameter extends Node {
    /**
     * Parameter name
     *
     * @var string
     */
    public $name;
    /**
     * Parameter value
     *
     * @var string
     */
    public $value;
    /**
     * Sets up the object
     *
     * @param string $name
     * @param string $value
     */
    public function __construct($name, $value = null) {
        if (!is_scalar($value) && !is_null($value)) {
            throw new \InvalidArgumentException('The value argument must be a scalar value or null');
        }
        $this->name = strtoupper($name);
        $this->value = $value;
    }
    /**
     * Returns the parameter's internal value.
     *
     * @return string
     */
    public function getValue() {
        return $this->value;
    }
    /**
     * Turns the object back into a serialized blob.
     *
     * @return string
     */
    public function serialize() {
        if (is_null($this->value)) {
            return $this->name;
        }
        $value = str_replace("\n", '\n', $this->value);
        if (preg_match('#(?: [:;\\\\])#x', $value)) {
            $value = '"' . $value . '"';
        }
        return $this->name . '=' . $value;
    }
    /**
     * Called when this object is being cast to a string
     *
     * @return string
     */
    public function __toString() {
        return $this->value;
    }
}
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