PHP Warning: Illegal string offset…

  • I constantly get a lot of warnings like

    PHP Warning: Illegal string offset 'cache_control' in wordpress-social-login/hybridauth/Hybrid/thirdparty/OAuth/OAuth1Client.php on line 263

    We run WP on php 7 and this is compatibility issue.

    OAuth1Client has $http_header property declared as string. When OAuthClient1::getHeader parses response headers it rises PHP Warning on line

    $this->http_header[$key] = $value;

    Please fix this by setting $http_header to null by default.

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