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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 |
---|---|
3545 |
|
3546 | /** |
3547 | * Filters whether a post trashing should take place. |
3548 | * |
3549 | * @since 4.9.0 |
3550 | * |
3551 | * @param bool|null $trash Whether to go forward with trashing. |
3552 | * @param WP_Post $post Post object. |
3553 | */ |
3554 | $check = apply_filters( 'pre_trash_post', null, $post ); |
3555 |
|
3556 | if ( null !== $check ) { |
3557 | return $check; |
3558 | } |
3559 |
|
3560 | /** |
3561 | * Fires before a post is sent to the Trash. |
3562 | * |
3563 | * @since 3.3.0 |