PHP errors on 5.4.43

[tdmalone]

I know this plugin requires at least PHP 5.3 due to its use of closures and namespaces, but are there any known compatibility issues beyond that?

I was able to use it fine on a server running PHP 5.5.15, but on another server with PHP 5.4.43 I get the following errors when WP_DEBUG is on (the errors only come up once this plugin is activated and disappear again when it is deactivated):

• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 925
• Notice: Undefined offset: 0 in ..../wp-includes/plugin.php on line 943
• Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in ..../wp-includes/plugin.php on line 525

In addition, on this server, the widget is not available, and I also noticed the admin menu item appears up amongst the posts (below Pages) whereas it is between Tools and Settings on the PHP 5.5.15 server, where it functions correctly.

[tdmalone]

I was able to solve this for now by changing a bunch of filters and one action to call defined functions rather than anonymous functions.

Following are all the filter/action calls I found I needed to change. They're all called in plugin.php:

• dfp_ads_menu_position
• dfp_ads_metabox_fields
• dfp_ads_settings_sections
• dfp_ads_settings_fields
• dfp_ads_import_sections
• dfp_ads_import_fields
• widgets_init

I'm still not sure exactly what is causing this problem as I can't see any reason why PHP 5.4.43 shouldn't fully support anonymous functions, and I'm not sure that I've caught all the ones which were having issues either.