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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 |
|---|---|
| 1370 | /** |
| 1371 | * Filter the value of a specific site transient before it is set. |
| 1372 | * |
| 1373 | * The dynamic portion of the hook name, $transient, refers to the transient name. |
| 1374 | * |
| 1375 | * @since 3.0.0 |
| 1376 | * |
| 1377 | * @param mixed $value Value of site transient. |
| 1378 | */ |
| 1379 | $value = apply_filters( 'pre_set_site_transient_' . $transient, $value ); |
| 1380 | |
| 1381 | $expiration = (int) $expiration; |
| 1382 | |
| 1383 | if ( wp_using_ext_object_cache() ) { |
| 1384 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1385 | } else { |
| 1386 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1387 | $option = '_site_transient_' . $transient; |
| 1388 | if ( false === get_site_option( $option ) ) { |