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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 |
|---|---|
| 993 | function image_size_input_fields( $post, $check = '' ) { |
| 994 | /** |
| 995 | * Filters the names and labels of the default image sizes. |
| 996 | * |
| 997 | * @since 3.3.0 |
| 998 | * |
| 999 | * @param array $size_names Array of image sizes and their names. Default values |
| 1000 | * include 'Thumbnail', 'Medium', 'Large', 'Full Size'. |
| 1001 | */ |
| 1002 | $size_names = apply_filters( 'image_size_names_choose', array( |
| 1003 | 'thumbnail' => __( 'Thumbnail' ), |
| 1004 | 'medium' => __( 'Medium' ), |
| 1005 | 'large' => __( 'Large' ), |
| 1006 | 'full' => __( 'Full Size' ) |
| 1007 | ) ); |
| 1008 | |
| 1009 | if ( empty( $check ) ) { |
| 1010 | $check = get_user_setting('imgsize', 'medium'); |
| 1011 | } |