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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 |
|---|---|
| 555 | |
| 556 | /** |
| 557 | * Filters the image sizes generated for non-image mime types. |
| 558 | * |
| 559 | * @since 4.7.0 |
| 560 | * |
| 561 | * @param string[] $fallback_sizes An array of image size names. |
| 562 | * @param array $metadata Current attachment metadata. |
| 563 | */ |
| 564 | $fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata ); |
| 565 | |
| 566 | $registered_sizes = wp_get_registered_image_subsizes(); |
| 567 | $merged_sizes = array_intersect_key( $registered_sizes, array_flip( $fallback_sizes ) ); |
| 568 | |
| 569 | // Force thumbnails to be soft crops. |
| 570 | if ( isset( $merged_sizes['thumbnail'] ) && is_array( $merged_sizes['thumbnail'] ) ) { |
| 571 | $merged_sizes['thumbnail']['crop'] = false; |
| 572 | } |
| 573 | |