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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 |
|---|---|
| 226 | |
| 227 | /** |
| 228 | * Filters the image sizes generated for non-image mime types. |
| 229 | * |
| 230 | * @since 4.7.0 |
| 231 | * |
| 232 | * @param array $fallback_sizes An array of image size names. |
| 233 | * @param array $metadata Current attachment metadata. |
| 234 | */ |
| 235 | $fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata ); |
| 236 | |
| 237 | $sizes = array(); |
| 238 | $_wp_additional_image_sizes = wp_get_additional_image_sizes(); |
| 239 | |
| 240 | foreach ( $fallback_sizes as $s ) { |
| 241 | if ( isset( $_wp_additional_image_sizes[ $s ]['width'] ) ) { |
| 242 | $sizes[ $s ]['width'] = intval( $_wp_additional_image_sizes[ $s ]['width'] ); |
| 243 | } else { |
| 244 | $sizes[ $s ]['width'] = get_option( "{$s}_size_w" ); |