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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 |
|---|---|
| 583 | |
| 584 | /** |
| 585 | * Filters the image sizes generated for non-image mime types. |
| 586 | * |
| 587 | * @since 4.7.0 |
| 588 | * |
| 589 | * @param string[] $fallback_sizes An array of image size names. |
| 590 | * @param array $metadata Current attachment metadata. |
| 591 | */ |
| 592 | $fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata ); |
| 593 | |
| 594 | $registered_sizes = wp_get_registered_image_subsizes(); |
| 595 | $merged_sizes = array_intersect_key( $registered_sizes, array_flip( $fallback_sizes ) ); |
| 596 | |
| 597 | // Force thumbnails to be soft crops. |
| 598 | if ( isset( $merged_sizes['thumbnail'] ) && is_array( $merged_sizes['thumbnail'] ) ) { |
| 599 | $merged_sizes['thumbnail']['crop'] = false; |
| 600 | } |
| 601 | |