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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 |
|---|---|
| 488 | * |
| 489 | * @param string $transient Transient name. Expected to not be SQL-escaped. |
| 490 | * @param mixed $value Transient value. Expected to not be SQL-escaped. |
| 491 | * @param int $expiration Time until expiration in seconds, default 0 |
| 492 | * @return bool False if value was not set and true if value was set. |
| 493 | */ |
| 494 | function set_transient( $transient, $value, $expiration = 0 ) { |
| 495 | global $_wp_using_ext_object_cache; |
| 496 | |
| 497 | $value = apply_filters( 'pre_set_transient_' . $transient, $value ); |
| 498 | |
| 499 | if ( $_wp_using_ext_object_cache ) { |
| 500 | $result = wp_cache_set( $transient, $value, 'transient', $expiration ); |
| 501 | } else { |
| 502 | $transient_timeout = '_transient_timeout_' . $transient; |
| 503 | $transient = '_transient_' . $transient; |
| 504 | if ( false === get_option( $transient ) ) { |
| 505 | $autoload = 'yes'; |
| 506 | if ( $expiration ) { |