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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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2344 |
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2345 | /** |
2346 | * Filters a term before it is sanitized and inserted into the database. |
2347 | * |
2348 | * @since 3.0.0 |
2349 | * |
2350 | * @param string|WP_Error $term The term name to add, or a WP_Error object if there's an error. |
2351 | * @param string $taxonomy Taxonomy slug. |
2352 | */ |
2353 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
2354 |
|
2355 | if ( is_wp_error( $term ) ) { |
2356 | return $term; |
2357 | } |
2358 |
|
2359 | if ( is_int( $term ) && 0 === $term ) { |
2360 | return new WP_Error( 'invalid_term_id', __( 'Invalid term ID.' ) ); |
2361 | } |
2362 |
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