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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 |
---|---|
2669 | } |
2670 |
|
2671 | if ( current_user_can( 'delete_post', $attachment->ID ) ) |
2672 | $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID ); |
2673 |
|
2674 | if ( $meta && 'image' === $type ) { |
2675 | $sizes = array(); |
2676 |
|
2677 | /** This filter is documented in wp-admin/includes/media.php */ |
2678 | $possible_sizes = apply_filters( 'image_size_names_choose', array( |
2679 | 'thumbnail' => __('Thumbnail'), |
2680 | 'medium' => __('Medium'), |
2681 | 'large' => __('Large'), |
2682 | 'full' => __('Full Size'), |
2683 | ) ); |
2684 | unset( $possible_sizes['full'] ); |
2685 |
|
2686 | // Loop through all potential sizes that may be chosen. Try to do this with some efficiency. |
2687 | // First: run the image_downsize filter. If it returns something, we can use its data. |