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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 |
|---|---|
| 3245 | * @package WordPress |
| 3246 | * @subpackage Transient |
| 3247 | * |
| 3248 | * @param string $transient Transient name. Expected to not be SQL-escaped |
| 3249 | * @return mixed Value of transient |
| 3250 | */ |
| 3251 | function get_site_transient($transient) { |
| 3252 | global $_wp_using_ext_object_cache, $wpdb; |
| 3253 | |
| 3254 | $pre = apply_filters( 'pre_site_transient_' . $transient, false ); |
| 3255 | if ( false !== $pre ) |
| 3256 | return $pre; |
| 3257 | |
| 3258 | if ( $_wp_using_ext_object_cache ) { |
| 3259 | $value = wp_cache_get($transient, 'site-transient'); |
| 3260 | } else { |
| 3261 | $transient_option = '_site_transient_' . esc_sql($transient); |
| 3262 | $transient_timeout = '_site_transient_timeout_' . esc_sql($transient); |
| 3263 | if ( get_site_option($transient_timeout) < time() ) { |