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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 |
---|---|
1913 | * |
1914 | * @since 2.9.0 |
1915 | * @since 4.4.0 The `$transient` parameter was added. |
1916 | * |
1917 | * @param mixed $pre_site_transient The default value to return if the site transient does not exist. |
1918 | * Any value other than false will short-circuit the retrieval |
1919 | * of the transient, and return that value. |
1920 | * @param string $transient Transient name. |
1921 | */ |
1922 | $pre = apply_filters( "pre_site_transient_{$transient}", false, $transient ); |
1923 |
|
1924 | if ( false !== $pre ) { |
1925 | return $pre; |
1926 | } |
1927 |
|
1928 | if ( wp_using_ext_object_cache() || wp_installing() ) { |
1929 | $value = wp_cache_get( $transient, 'site-transient' ); |
1930 | } else { |
1931 | // Core transients that do not have a timeout. Listed here so querying timeouts can be avoided. |