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What does `get_the_excerpt()` return when called outside the loop without an argument?

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What is the purpose of the `template_redirect` action hook?

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What is `wp_remote_retrieve_body()` used for after a `wp_remote_get()` call?

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What is the `wp_list_pluck()` function used for?

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What does `current_user_can()` do in WordPress?

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What is the `wp_upload_dir()` function used for?

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What is `wp_json_encode()` and how does it differ from `json_encode()`?

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What is the `doing_it_wrong()` function in WordPress used for?

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What does `WP_DEBUG_LOG` do when set to true in wp-config.php?

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What is the purpose of `absint()` in WordPress?

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Which WordPress function retrieves all terms for a given taxonomy?

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What is the `wp_doing_ajax()` function used for?

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What does `get_queried_object()` return on a single post page?

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What is the role of `wp-cron.php` in the WordPress file structure?

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What PHP function does WordPress use internally to hash passwords?

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What does `is_main_query()` return inside a `pre_get_posts` callback?

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What is the purpose of `wp_get_environment_type()` introduced in WordPress 5.5?

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What is the WordPress `get_posts()` vs `WP_Query` design decision and when should each be used?

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