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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 |
|---|---|
| 734 | * @package WordPress |
| 735 | * @subpackage Transient |
| 736 | * |
| 737 | * @param string $transient Transient name. Expected to not be SQL-escaped |
| 738 | * @return mixed Value of transient |
| 739 | */ |
| 740 | function get_transient( $transient ) { |
| 741 | global $_wp_using_ext_object_cache; |
| 742 | |
| 743 | $pre = apply_filters( 'pre_transient_' . $transient, false ); |
| 744 | if ( false !== $pre ) |
| 745 | return $pre; |
| 746 | |
| 747 | if ( $_wp_using_ext_object_cache ) { |
| 748 | $value = wp_cache_get( $transient, 'transient' ); |
| 749 | } else { |
| 750 | $transient_option = '_transient_' . $transient; |
| 751 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 752 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |