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wpdb::get_var( string|null $query = null, int $x, int $y ): string|null

Retrieves one variable from the database.

Description

Executes a SQL query and returns the value from the SQL result.
If the SQL result contains more than one column and/or more than one row, the value in the column and row specified is returned. If $query is null, the value in the specified column and row from the previous SQL result is returned.

Parameters

$query string|null Optional
SQL query. Defaults to null, use the result from the previous query.

Default: null

$x int Optional
Column of value to return. Indexed from 0.
$y int Optional
Row of value to return. Indexed from 0.

Return

string|null Database query result (as string), or null on failure.

Source

File: wp-includes/class-wpdb.php. View all references

public function get_var( $query = null, $x = 0, $y = 0 ) {
	$this->func_call = "\$db->get_var(\"$query\", $x, $y)";

	if ( $query ) {
		if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
			$this->check_current_query = false;
		}

		$this->query( $query );
	}

	// Extract var out of cached results based on x,y vals.
	if ( ! empty( $this->last_result[ $y ] ) ) {
		$values = array_values( get_object_vars( $this->last_result[ $y ] ) );
	}

	// If there is a value return it, else return null.
	return ( isset( $values[ $x ] ) && '' !== $values[ $x ] ) ? $values[ $x ] : null;
}

Uses

Uses Description
wpdb::check_safe_collation() wp-includes/class-wpdb.php

Checks if the query is accessing a collation considered safe on the current version of MySQL.
wpdb::query() wp-includes/class-wpdb.php

Performs a database query, using current database connection.

Used By

Used By Description
wp_update_user_counts() wp-includes/user.php

Updates the total count of users on the site.
_wp_batch_update_comment_type() wp-includes/comment.php

Updates the comment type for a batch of comments.
WP_Debug_Data::debug_data() wp-admin/includes/class-wp-debug-data.php

Static function for generating site debug data when required.
WP_Site_Health::prepare_sql_data() wp-admin/includes/class-wp-site-health.php

Runs the SQL version checks.
is_site_meta_supported() wp-includes/functions.php

Determines whether site meta is enabled.
_find_post_by_old_slug() wp-includes/query.php

Find the post ID for redirecting an old slug.
_find_post_by_old_date() wp-includes/query.php

Find the post ID for redirecting an old date.
wp_check_comment_flood() wp-includes/comment.php

Checks whether comment flooding is occurring.
WP_Term_Query::get_terms() wp-includes/class-wp-term-query.php

Retrieves the query results.
WP_Network_Query::set_found_networks() wp-includes/class-wp-network-query.php

Populates found_networks and max_num_pages properties for the current query if the limit clause was used.
WP_Network_Query::get_network_ids() wp-includes/class-wp-network-query.php

Used internally to get a list of network IDs matching the query vars.
WP_Comment_Query::set_found_comments() wp-includes/class-wp-comment-query.php

Populates found_comments and max_num_pages properties for the current query if the limit clause was used.
WP_Site_Query::get_site_ids() wp-includes/class-wp-site-query.php

Used internally to get a list of site IDs matching the query vars.
WP_Site_Query::set_found_sites() wp-includes/class-wp-site-query.php

Populates found_sites and max_num_pages properties for the current query if the limit clause was used.
wp_term_is_shared() wp-includes/taxonomy.php

Determines whether a term is shared between multiple taxonomies.
WP_Comment_Query::get_comment_ids() wp-includes/class-wp-comment-query.php

Used internally to get a list of comment IDs matching the query vars.
network_step2() wp-admin/includes/network.php

Prints step 2 for Network installation process.
display_setup_form() wp-admin/install.php

Displays installer setup form.
network_domain_check() wp-admin/includes/network.php

Check for an existing network.
WP_User_Search::query() wp-admin/includes/deprecated.php

Executes the user search query.
populate_network() wp-admin/includes/schema.php

Populate network settings.
maybe_disable_link_manager() wp-admin/includes/upgrade.php

Disables the Link Manager on upgrade if, at the time of upgrade, no links exist in the DB.
pre_schema_upgrade() wp-admin/includes/upgrade.php

Runs before the schema is upgraded.
maybe_create_table() wp-admin/includes/upgrade.php

Creates a table in the database, if it doesn’t already exist.
upgrade_network() wp-admin/includes/upgrade.php

Executes network-level upgrade routines.
update_gallery_tab() wp-admin/includes/media.php

Adds the gallery tab back to the tabs array if post has image attachments.
post_exists() wp-admin/includes/post.php

Determines if a post exists based on title, content, date and type.
comment_exists() wp-admin/includes/comment.php

Determines if a comment exists based on author and date.
WP_Posts_List_Table::__construct() wp-admin/includes/class-wp-posts-list-table.php

Constructor.
wp_notify_moderator() wp-includes/pluggable.php

Notifies the moderator of the site about a new comment that is awaiting approval.
get_calendar() wp-includes/general-template.php

Displays calendar with days that have posts as links.
WP_Query::set_found_posts() wp-includes/class-wp-query.php

Set up the amount of found posts and the number of pages (if limit clause was used) for the current query.
is_blog_installed() wp-includes/functions.php

Determines whether WordPress is already installed.
do_enclose() wp-includes/functions.php

Checks content for video and audio links to add as enclosures.
_update_post_term_count() wp-includes/taxonomy.php

Updates term count based on object types of the current taxonomy.
_update_generic_term_count() wp-includes/taxonomy.php

Updates term count based on number of objects.
wp_unique_term_slug() wp-includes/taxonomy.php

Makes term slug unique, if it isn’t already.
wp_update_term() wp-includes/taxonomy.php

Updates term based on arguments provided.
wp_insert_term() wp-includes/taxonomy.php

Adds a new term to the database.
wp_set_object_terms() wp-includes/taxonomy.php

Creates term and taxonomy relationships.
wp_delete_term() wp-includes/taxonomy.php

Removes a term from the database.
get_adjacent_post() wp-includes/link-template.php

Retrieves the adjacent post.
ms_allowed_http_request_hosts() wp-includes/http.php

Adds any domain in a multisite installation for safe HTTP requests to the allowed list.
WP_User_Query::query() wp-includes/class-wp-user-query.php

Executes the query, with the current variables.
wp_insert_user() wp-includes/user.php

Inserts a user into the database.
count_user_posts() wp-includes/user.php

Gets the number of posts a user has written.
wp_enqueue_media() wp-includes/media.php

Enqueues all scripts, styles, settings, and templates necessary to use all media JS APIs.
_get_last_post_time() wp-includes/post.php

Gets the timestamp of the last time any post was modified or published.
wp_unique_post_slug() wp-includes/post.php

Computes a unique slug for the post, when given the desired slug and some post details.
wp_insert_post() wp-includes/post.php

Inserts or update a post.
wp_count_attachments() wp-includes/post.php

Counts number of attachments for the mime type(s).
redirect_canonical() wp-includes/canonical.php

Redirects incoming links to the proper URL based on the site url.
redirect_guess_404_permalink() wp-includes/canonical.php

Attempts to guess the correct URL for a 404 request based on query vars.
update_posts_count() wp-includes/ms-functions.php

Updates a blog’s post count.
wpmu_validate_blog_signup() wp-includes/ms-functions.php

Processes new site registrations.
ms_not_installed() wp-includes/ms-load.php

Displays a failure message.
get_blog_list() wp-includes/ms-deprecated.php

Deprecated functionality to retrieve a list of all sites.
get_blog_status() wp-includes/ms-blogs.php

Get a blog details field.
wp_xmlrpc_server::pingback_ping() wp-includes/class-wp-xmlrpc-server.php

Retrieves a pingback and registers it.
wpdb::get_col() wp-includes/class-wpdb.php

Retrieves one column from the database.
wp_update_comment_count_now() wp-includes/comment.php

Updates the comment count for the post.
get_lastcommentmodified() wp-includes/comment.php

Retrieves the date the last comment was modified.
wp_allow_comment() wp-includes/comment.php

Validates whether this comment is allowed to be made.
check_comment() wp-includes/comment.php

Checks whether a comment passes internal checks to be allowed to add.
add_metadata() wp-includes/meta.php

Adds metadata for the specified object.

Changelog

Version Description
0.71 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wpdb/get_var