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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.
This hook occurs 2 times in this file.
Line | Code |
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166 | if ( empty( $missing_sizes ) ) { |
167 | return $image_meta; |
168 | } |
169 |
|
170 | // This also updates the image meta. |
171 | $image_meta = _wp_make_subsizes( $missing_sizes, $image_file, $image_meta, $attachment_id ); |
172 | } |
173 |
|
174 | /** This filter is documented in wp-admin/includes/image.php */ |
175 | $image_meta = apply_filters( 'wp_generate_attachment_metadata', $image_meta, $attachment_id, 'update' ); |
176 |
|
177 | // Save the updated metadata. |
178 | wp_update_attachment_metadata( $attachment_id, $image_meta ); |
179 |
|
180 | return $image_meta; |
181 | } |
182 |
|
183 | /** |
184 | * Updates the attached file and image meta data when the original image was edited. |
Line | Code |
622 | * |
623 | * @since 2.1.0 |
624 | * @since 5.3.0 The `$context` parameter was added. |
625 | * |
626 | * @param array $metadata An array of attachment meta data. |
627 | * @param int $attachment_id Current attachment ID. |
628 | * @param string $context Additional context. Can be 'create' when metadata was initially created for new attachment |
629 | * or 'update' when the metadata was updated. |
630 | */ |
631 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'create' ); |
632 | } |
633 |
|
634 | /** |
635 | * Convert a fraction string to a decimal. |
636 | * |
637 | * @since 2.5.0 |
638 | * |
639 | * @param string $str |
640 | * @return int|float |