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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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172 | if ( empty( $missing_sizes ) ) { |
173 | return $image_meta; |
174 | } |
175 |
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176 | // This also updates the image meta. |
177 | $image_meta = _wp_make_subsizes( $missing_sizes, $image_file, $image_meta, $attachment_id ); |
178 | } |
179 |
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180 | /** This filter is documented in wp-admin/includes/image.php */ |
181 | $image_meta = apply_filters( 'wp_generate_attachment_metadata', $image_meta, $attachment_id, 'update' ); |
182 |
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183 | // Save the updated metadata. |
184 | wp_update_attachment_metadata( $attachment_id, $image_meta ); |
185 |
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186 | return $image_meta; |
187 | } |
188 |
|
189 | /** |
190 | * Updates the attached file and image meta data when the original image was edited. |
Line | Code |
647 | * |
648 | * @since 2.1.0 |
649 | * @since 5.3.0 The `$context` parameter was added. |
650 | * |
651 | * @param array $metadata An array of attachment meta data. |
652 | * @param int $attachment_id Current attachment ID. |
653 | * @param string $context Additional context. Can be 'create' when metadata was initially created for new attachment |
654 | * or 'update' when the metadata was updated. |
655 | */ |
656 | return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'create' ); |
657 | } |
658 |
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659 | /** |
660 | * Convert a fraction string to a decimal. |
661 | * |
662 | * @since 2.5.0 |
663 | * |
664 | * @param string $str Fraction string. |
665 | * @return int|float Returns calculated fraction or integer 0 on invalid input. |