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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 |
|---|---|
| 488 | $search_columns = array('user_email'); |
| 489 | elseif ( is_numeric($search) ) |
| 490 | $search_columns = array('user_login', 'ID'); |
| 491 | elseif ( preg_match('|^https?://|', $search) && ! ( is_multisite() && wp_is_large_network( 'users' ) ) ) |
| 492 | $search_columns = array('user_url'); |
| 493 | else |
| 494 | $search_columns = array('user_login', 'user_nicename'); |
| 495 | } |
| 496 | |
| 497 | $search_columns = apply_filters( 'user_search_columns', $search_columns, $search, $this ); |
| 498 | |
| 499 | $this->query_where .= $this->get_search_sql( $search, $search_columns, $wild ); |
| 500 | } |
| 501 | |
| 502 | $blog_id = 0; |
| 503 | if ( isset( $qv['blog_id'] ) ) |
| 504 | $blog_id = absint( $qv['blog_id'] ); |
| 505 | |
| 506 | if ( isset( $qv['who'] ) && 'authors' == $qv['who'] && $blog_id ) { |