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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 |
|---|---|
| 669 | * @package WordPress |
| 670 | * @subpackage Transient |
| 671 | * |
| 672 | * @param string $transient Transient name. Expected to not be SQL-escaped |
| 673 | * @return mixed Value of transient |
| 674 | */ |
| 675 | function get_transient($transient) { |
| 676 | global $_wp_using_ext_object_cache, $wpdb; |
| 677 | |
| 678 | $pre = apply_filters( 'pre_transient_' . $transient, false ); |
| 679 | if ( false !== $pre ) |
| 680 | return $pre; |
| 681 | |
| 682 | if ( $_wp_using_ext_object_cache ) { |
| 683 | $value = wp_cache_get($transient, 'transient'); |
| 684 | } else { |
| 685 | $transient_option = '_transient_' . $wpdb->escape($transient); |
| 686 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |
| 687 | $alloptions = wp_load_alloptions(); |