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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 |
|---|---|
| 1511 | * @since 4.4.0 |
| 1512 | * |
| 1513 | * @param string $sizes A source size value for use in a 'sizes' attribute. |
| 1514 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 1515 | * an array of width and height values in pixels (in that order). |
| 1516 | * @param string|null $image_src The URL to the image file or null. |
| 1517 | * @param array|null $image_meta The image meta data as returned by wp_get_attachment_metadata() or null. |
| 1518 | * @param int $attachment_id Image attachment ID of the original image or 0. |
| 1519 | */ |
| 1520 | return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id ); |
| 1521 | } |
| 1522 | |
| 1523 | /** |
| 1524 | * Determines if the image meta data is for the image source file. |
| 1525 | * |
| 1526 | * The image meta data is retrieved by attachment post ID. In some cases the post IDs may change. |
| 1527 | * For example when the website is exported and imported at another website. Then the |
| 1528 | * attachment post IDs that are in post_content for the exported website may not match |
| 1529 | * the same attachments at the new website. |