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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 |
|---|---|
| 479 | <?php |
| 480 | /** This action is documented in wp-admin/admin-header.php */ |
| 481 | do_action( 'admin_enqueue_scripts', 'media-upload-popup' ); |
| 482 | |
| 483 | /** |
| 484 | * Fires when admin styles enqueued for the legacy (pre-3.5.0) media upload popup are printed. |
| 485 | * |
| 486 | * @since 2.9.0 |
| 487 | */ |
| 488 | do_action( 'admin_print_styles-media-upload-popup' ); |
| 489 | |
| 490 | /** This action is documented in wp-admin/admin-header.php */ |
| 491 | do_action( 'admin_print_styles' ); |
| 492 | |
| 493 | /** |
| 494 | * Fires when admin scripts enqueued for the legacy (pre-3.5.0) media upload popup are printed. |
| 495 | * |
| 496 | * @since 2.9.0 |
| 497 | */ |