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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 |
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1595 |
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1596 | /** |
1597 | * Filter the SQL JOIN clause for retrieving archives. |
1598 | * |
1599 | * @since 2.2.0 |
1600 | * |
1601 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
1602 | * @param array $r An array of default arguments. |
1603 | */ |
1604 | $join = apply_filters( 'getarchives_join', '', $r ); |
1605 |
|
1606 | $output = ''; |
1607 |
|
1608 | $last_changed = wp_cache_get( 'last_changed', 'posts' ); |
1609 | if ( ! $last_changed ) { |
1610 | $last_changed = microtime(); |
1611 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
1612 | } |
1613 |
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