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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 |
|---|---|
| 127 | /** |
| 128 | * Filters the array of missing image sub-sizes for an uploaded image. |
| 129 | * |
| 130 | * @since 5.3.0 |
| 131 | * |
| 132 | * @param array $missing_sizes Array with the missing image sub-sizes. |
| 133 | * @param array $image_meta The image meta data. |
| 134 | * @param int $attachment_id The image attachment post ID. |
| 135 | */ |
| 136 | return apply_filters( 'wp_get_missing_image_subsizes', $missing_sizes, $image_meta, $attachment_id ); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * If any of the currently registered image sub-sizes are missing, |
| 141 | * create them and update the image meta data. |
| 142 | * |
| 143 | * @since 5.3.0 |
| 144 | * |
| 145 | * @param int $attachment_id The image attachment post ID. |