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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 |
|---|---|
| 549 | <?php |
| 550 | /** This action is documented in wp-admin/admin-header.php */ |
| 551 | do_action( 'admin_enqueue_scripts', 'media-upload-popup' ); |
| 552 | |
| 553 | /** |
| 554 | * Fires when admin styles enqueued for the legacy (pre-3.5.0) media upload popup are printed. |
| 555 | * |
| 556 | * @since 2.9.0 |
| 557 | */ |
| 558 | do_action( 'admin_print_styles-media-upload-popup' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores |
| 559 | |
| 560 | /** This action is documented in wp-admin/admin-header.php */ |
| 561 | do_action( 'admin_print_styles' ); |
| 562 | |
| 563 | /** |
| 564 | * Fires when admin scripts enqueued for the legacy (pre-3.5.0) media upload popup are printed. |
| 565 | * |
| 566 | * @since 2.9.0 |
| 567 | */ |