WordPress is giving errors after activating WP_DEBUG

Firstly, fixing those is not essential, but it would pay to keep them in mind. For your live site WP_DEBUG should be false (development sites should have this on so that as you write the code you are warned of these things).

1) This is probably just a matter of removing the & in the &=. You should let the developer of the php_exec plugin know (and they should fix it in the future). The name of the plugin comes up as a major red flag for me, as letting a site admin (as opposed to a web developer) or any other user execute PHP code is very dangerous.

2) Somewhere in your site there is call to the function add_custom_background (I’m guessing theme, but I could be wrong). This function will be removed at some time in the future so should be replaced with what they suggest (add_theme_support( 'custom-background', $args ) I believe). Again you should notify the developer of the theme or plugin that makes the call.

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