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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 |
|---|---|
| 69 | if ( empty($description) ) |
| 70 | $description = ''; |
| 71 | $description = apply_filters('pre_user_description', $description); |
| 72 | |
| 73 | if ( empty($user_registered) ) |
| 74 | $user_registered = gmdate('Y-m-d H:i:s'); |
| 75 | |
| 76 | if ( $update ) { |
| 77 | $query = "UPDATE $wpdb->users SET user_pass='$user_pass', user_email='$user_email', user_url='$user_url', user_nicename = '$user_nicename', display_name = '$display_name' WHERE ID = '$ID'"; |
| 78 | $query = apply_filters('update_user_query', $query); |
| 79 | $wpdb->query( $query ); |
| 80 | $user_id = (int) $ID; |
| 81 | } else { |
| 82 | $query = "INSERT INTO $wpdb->users |
| 83 | (user_login, user_pass, user_email, user_url, user_registered, user_nicename, display_name) |
| 84 | VALUES |
| 85 | ('$user_login', '$user_pass', '$user_email', '$user_url', '$user_registered', '$user_nicename', '$display_name')"; |
| 86 | $query = apply_filters('create_user_query', $query); |
| 87 | $wpdb->query( $query ); |