PHP Auth_OpenID_noMathSupport函數代碼示例

function Auth_OpenID_getDefaultAssociationOrder()
{
    $order = array();
    if (!Auth_OpenID_noMathSupport()) {
        $order[] = array('HMAC-SHA1', 'DH-SHA1');
        if (Auth_OpenID_HMACSHA256_SUPPORTED) {
            $order[] = array('HMAC-SHA256', 'DH-SHA256');
        }
    }
    $order[] = array('HMAC-SHA1', 'no-encryption');
    if (Auth_OpenID_HMACSHA256_SUPPORTED) {
        $order[] = array('HMAC-SHA256', 'no-encryption');
    }
    return $order;
}

/**
 * {@link Auth_OpenID_getMathLib} checks for the presence of long
 * number extension modules and returns an instance of
 * {@link Auth_OpenID_MathWrapper} which exposes the module's
 * functionality.
 *
 * Checks for the existence of an extension module described by the
 * result of {@link Auth_OpenID_math_extensions()} and returns an
 * instance of a wrapper for that extension module.  If no extension
 * module is found, an instance of {@link Auth_OpenID_MathWrapper} is
 * returned, which wraps the native PHP integer implementation.  The
 * proper calling convention for this method is $lib =
 * Auth_OpenID_getMathLib().
 *
 * This function checks for the existence of specific long number
 * implementations in the following order: GMP followed by BCmath.
 *
 * @return Auth_OpenID_MathWrapper $instance An instance of
 * {@link Auth_OpenID_MathWrapper} or one of its subclasses
 *
 * @package OpenID
 */
function Auth_OpenID_getMathLib()
{
    // The instance of Auth_OpenID_MathWrapper that we choose to
    // supply will be stored here, so that subseqent calls to this
    // method will return a reference to the same object.
    static $lib = null;
    if (isset($lib)) {
        return $lib;
    }
    if (Auth_OpenID_noMathSupport()) {
        $null = null;
        return $null;
    }
    // If this method has not been called before, look at
    // Auth_OpenID_math_extensions and try to find an extension that
    // works.
    $ext = Auth_OpenID_detectMathLibrary(Auth_OpenID_math_extensions());
    if ($ext === false) {
        $tried = array();
        foreach (Auth_OpenID_math_extensions() as $extinfo) {
            $tried[] = $extinfo['extension'];
        }
        $triedstr = implode(", ", $tried);
        Auth_OpenID_setNoMathSupport();
        $result = null;
        return $result;
    }
    // Instantiate a new wrapper
    $class = $ext['class'];
    $lib = new $class();
    return $lib;
}