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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 |
|---|---|
| 601 | /** |
| 602 | * Filter an existing transient's value. |
| 603 | * |
| 604 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 605 | * |
| 606 | * @since 2.8.0 |
| 607 | * |
| 608 | * @param mixed $value Value of transient. |
| 609 | */ |
| 610 | return apply_filters( 'transient_' . $transient, $value ); |
| 611 | } |
| 612 | |
| 613 | /** |
| 614 | * Set/update the value of a transient. |
| 615 | * |
| 616 | * You do not need to serialize values. If the value needs to be serialized, then |
| 617 | * it will be serialized before it is set. |
| 618 | * |
| 619 | * @since 2.8.0 |