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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 |
|---|---|
| 1408 | /** |
| 1409 | * Filter the value of a specific site transient before it is set. |
| 1410 | * |
| 1411 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1412 | * |
| 1413 | * @since 3.0.0 |
| 1414 | * |
| 1415 | * @param mixed $value Value of site transient. |
| 1416 | */ |
| 1417 | $value = apply_filters( 'pre_set_site_transient_' . $transient, $value ); |
| 1418 | |
| 1419 | $expiration = (int) $expiration; |
| 1420 | |
| 1421 | if ( wp_using_ext_object_cache() ) { |
| 1422 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1423 | } else { |
| 1424 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1425 | $option = '_site_transient_' . $transient; |
| 1426 | if ( false === get_site_option( $option ) ) { |