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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 |
|---|---|
| 3169 | } |
| 3170 | |
| 3171 | if ( current_user_can( 'delete_post', $attachment->ID ) ) |
| 3172 | $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID ); |
| 3173 | |
| 3174 | if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) { |
| 3175 | $sizes = array(); |
| 3176 | |
| 3177 | /** This filter is documented in wp-admin/includes/media.php */ |
| 3178 | $possible_sizes = apply_filters( 'image_size_names_choose', array( |
| 3179 | 'thumbnail' => __('Thumbnail'), |
| 3180 | 'medium' => __('Medium'), |
| 3181 | 'large' => __('Large'), |
| 3182 | 'full' => __('Full Size'), |
| 3183 | ) ); |
| 3184 | unset( $possible_sizes['full'] ); |
| 3185 | |
| 3186 | // Loop through all potential sizes that may be chosen. Try to do this with some efficiency. |
| 3187 | // First: run the image_downsize filter. If it returns something, we can use its data. |