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<?php

/**
 * Validates tel (for phone numbers).
 *
 * The relevant specifications for this protocol are RFC 3966 and RFC 5341,
 * but this class takes a much simpler approach: we normalize phone
 * numbers so that they only include (possibly) a leading plus,
 * and then any number of digits and x'es.
 */

class HTMLPurifier_URIScheme_tel extends HTMLPurifier_URIScheme
{
    /**
     * @type bool
     */
    public $browsable = false;

/**
     * @type bool
     */
    public $may_omit_host = true;

/**
     * @param HTMLPurifier_URI $uri
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool
     */
    public function doValidate(&$uri, $config, $context)
    {
        $uri->userinfo = null;
        $uri->host     = null;
        $uri->port     = null;

// Delete all non-numeric characters, non-x characters
        // from phone number, EXCEPT for a leading plus sign.
        $uri->path = preg_replace('/(?!^\+)[^\dx]/', '',
                     // Normalize e(x)tension to lower-case
                     str_replace('X', 'x', $uri->path));

return true;
    }
}

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