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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 |
|---|---|
| 1910 | * |
| 1911 | * @since 2.9.0 |
| 1912 | * @since 4.4.0 The `$transient` parameter was added. |
| 1913 | * |
| 1914 | * @param mixed $pre_site_transient The default value to return if the site transient does not exist. |
| 1915 | * Any value other than false will short-circuit the retrieval |
| 1916 | * of the transient, and return that value. |
| 1917 | * @param string $transient Transient name. |
| 1918 | */ |
| 1919 | $pre = apply_filters( "pre_site_transient_{$transient}", false, $transient ); |
| 1920 | |
| 1921 | if ( false !== $pre ) { |
| 1922 | return $pre; |
| 1923 | } |
| 1924 | |
| 1925 | if ( wp_using_ext_object_cache() ) { |
| 1926 | $value = wp_cache_get( $transient, 'site-transient' ); |
| 1927 | } else { |
| 1928 | // Core transients that do not have a timeout. Listed here so querying timeouts can be avoided. |