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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 |
|---|---|
| 439 | * @package WordPress |
| 440 | * @subpackage Transient |
| 441 | * |
| 442 | * @param string $transient Transient name. Expected to not be SQL-escaped |
| 443 | * @return mixed Value of transient |
| 444 | */ |
| 445 | function get_transient( $transient ) { |
| 446 | global $_wp_using_ext_object_cache; |
| 447 | |
| 448 | $pre = apply_filters( 'pre_transient_' . $transient, false ); |
| 449 | if ( false !== $pre ) |
| 450 | return $pre; |
| 451 | |
| 452 | if ( $_wp_using_ext_object_cache ) { |
| 453 | $value = wp_cache_get( $transient, 'transient' ); |
| 454 | } else { |
| 455 | $transient_option = '_transient_' . $transient; |
| 456 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 457 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |