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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 |
---|---|
2554 | * |
2555 | * - `rest_post_item_schema` |
2556 | * - `rest_page_item_schema` |
2557 | * - `rest_attachment_item_schema` |
2558 | * |
2559 | * @since 5.4.0 |
2560 | * |
2561 | * @param array $schema Item schema data. |
2562 | */ |
2563 | $schema = apply_filters( "rest_{$this->post_type}_item_schema", $schema ); |
2564 |
|
2565 | // Emit a _doing_it_wrong warning if user tries to add new properties using this filter. |
2566 | $new_fields = array_diff( array_keys( $schema['properties'] ), $schema_fields ); |
2567 | if ( count( $new_fields ) > 0 ) { |
2568 | _doing_it_wrong( |
2569 | __METHOD__, |
2570 | sprintf( |
2571 | /* translators: %s: register_rest_field */ |
2572 | __( 'Please use %s to add new schema properties.' ), |