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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 |
---|---|
1756 | * |
1757 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
1758 | * |
1759 | * @since 4.4.0 |
1760 | * |
1761 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
1762 | * @param mixed $value New value of site transient. |
1763 | * @param string $transient Transient name. |
1764 | */ |
1765 | $expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient ); |
1766 |
|
1767 | if ( wp_using_ext_object_cache() ) { |
1768 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
1769 | } else { |
1770 | $transient_timeout = '_site_transient_timeout_' . $transient; |
1771 | $option = '_site_transient_' . $transient; |
1772 | if ( false === get_site_option( $option ) ) { |
1773 | if ( $expiration ) |
1774 | add_site_option( $transient_timeout, time() + $expiration ); |