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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 |
---|---|
2532 | * Filters the post's schema. |
2533 | * |
2534 | * The dynamic portion of the filter, `$this->post_type`, refers to the |
2535 | * post type slug for the controller. |
2536 | * |
2537 | * @since 5.4.0 |
2538 | * |
2539 | * @param array $schema Item schema data. |
2540 | */ |
2541 | $schema = apply_filters( "rest_{$this->post_type}_item_schema", $schema ); |
2542 |
|
2543 | // Emit a _doing_it_wrong warning if user tries to add new properties using this filter. |
2544 | $new_fields = array_diff( array_keys( $schema['properties'] ), $schema_fields ); |
2545 | if ( count( $new_fields ) > 0 ) { |
2546 | _doing_it_wrong( |
2547 | __METHOD__, |
2548 | sprintf( |
2549 | /* translators: %s: register_rest_field */ |
2550 | __( 'Please use %s to add new schema properties.' ), |