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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 |
|---|---|
| 2450 | * Filters the default media display states for items in the Media list table. |
| 2451 | * |
| 2452 | * @since 3.2.0 |
| 2453 | * @since 4.8.0 Added the `$post` parameter. |
| 2454 | * |
| 2455 | * @param string[] $media_states An array of media states. Default 'Header Image', |
| 2456 | * 'Background Image', 'Site Icon', 'Logo'. |
| 2457 | * @param WP_Post $post The current attachment object. |
| 2458 | */ |
| 2459 | return apply_filters( 'display_media_states', $media_states, $post ); |
| 2460 | } |
| 2461 | |
| 2462 | /** |
| 2463 | * Tests support for compressing JavaScript from PHP. |
| 2464 | * |
| 2465 | * Outputs JavaScript that tests if compression from PHP works as expected |
| 2466 | * and sets an option with the result. Has no effect when the current user |
| 2467 | * is not an administrator. To run the test again the option 'can_compress_scripts' |
| 2468 | * has to be deleted. |