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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 80 | function get_default_feed() { |
| 81 | /** |
| 82 | * Filters the default feed type. |
| 83 | * |
| 84 | * @since 2.5.0 |
| 85 | * |
| 86 | * @param string $feed_type Type of default feed. Possible values include 'rss2', 'atom'. |
| 87 | * Default 'rss2'. |
| 88 | */ |
| 89 | $default_feed = apply_filters( 'default_feed', 'rss2' ); |
| 90 | |
| 91 | return ( 'rss' === $default_feed ) ? 'rss2' : $default_feed; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Retrieve the blog title for the feed title. |
| 96 | * |
| 97 | * @since 2.2.0 |
| 98 | * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`. |