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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 |
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65 |
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66 | /** |
67 | * Filters the RSS update frequency. |
68 | * |
69 | * @since 2.1.0 |
70 | * |
71 | * @param string $frequency An integer passed as a string representing the frequency |
72 | * of RSS updates within the update period. Default '1'. |
73 | */ |
74 | echo apply_filters( 'rss_update_frequency', $frequency ); |
75 | ?> |
76 | </sy:updateFrequency> |
77 | <?php |
78 | /** |
79 | * Fires at the end of the RSS2 Feed Header. |
80 | * |
81 | * @since 2.0.0 |
82 | */ |
83 | do_action( 'rss2_head' ); |