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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 |
|---|---|
| 516 | |
| 517 | /** This action is documented in wp-admin/admin-header.php */ |
| 518 | do_action( 'admin_print_styles' ); |
| 519 | |
| 520 | /** |
| 521 | * Fires when admin scripts enqueued for the legacy (pre-3.5.0) media upload popup are printed. |
| 522 | * |
| 523 | * @since 2.9.0 |
| 524 | */ |
| 525 | do_action( 'admin_print_scripts-media-upload-popup' ); |
| 526 | |
| 527 | /** This action is documented in wp-admin/admin-header.php */ |
| 528 | do_action( 'admin_print_scripts' ); |
| 529 | |
| 530 | /** |
| 531 | * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) |
| 532 | * media upload popup are printed. |
| 533 | * |
| 534 | * @since 2.9.0 |