Using master on MW 1.35 with PHP 7.4 creates the following PHP warning:
Warning: array_key_exists() expects parameter 2 to be array, null given in /../w/extensions/Iframe/Iframe_body.php on line 138
Using master on MW 1.35 with PHP 7.4 creates the following PHP warning:
Warning: array_key_exists() expects parameter 2 to be array, null given in /../w/extensions/Iframe/Iframe_body.php on line 138
I solved this by declaring `$wgIframe` as an array in `LocalSettings.php`:
<code>
$wgIframe = array();
wfLoadExtension( 'Iframe' ); # for embedding web sites, e.g. LBC map
$wgIframe['server']['google'] = [ 'scheme' => 'https', 'domain' => 'google.com' ];
</code>