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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.
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252 | ); |
253 |
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254 | /** |
255 | * Filters the list of available permalink structure tags on the Permalinks settings page. |
256 | * |
257 | * @since 4.8.0 |
258 | * |
259 | * @param string[] $available_tags An array of key => value pairs of available permalink structure tags. |
260 | */ |
261 | $available_tags = apply_filters( 'available_permalink_structure_tags', $available_tags ); |
262 |
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263 | /* translators: %s: permalink structure tag */ |
264 | $structure_tag_added = __( '%s added to permalink structure' ); |
265 |
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266 | /* translators: %s: permalink structure tag */ |
267 | $structure_tag_already_used = __( '%s (already used in permalink structure)' ); |
268 |
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269 | if ( ! empty( $available_tags ) ) : |
270 | ?> |