wpdb::get_results( string $query = null, string $output = OBJECT )

Retrieves an entire SQL result set from the database (i.e., many rows).

Description

Executes a SQL query and returns the entire SQL result.

Parameters

$query

(string) (Optional) SQL query.

Default value: null

$output

(string) (Optional) Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants. With one of the first three, return an array of rows indexed from 0 by SQL result row number. Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object ( ->column = value ), respectively. With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value. Duplicate keys are discarded.

Default value: OBJECT

Return

(array|object|null) Database query results.

Source

File: wp-includes/wp-db.php

public function get_results( $query = null, $output = OBJECT ) {
		$this->func_call = "\$db->get_results(\"$query\", $output)";

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

		if ( $query ) {
			$this->query( $query );
		} else {
			return null;
		}

		$new_array = array();
		if ( OBJECT === $output ) {
			// Return an integer-keyed array of row objects.
			return $this->last_result;
		} elseif ( OBJECT_K === $output ) {
			// Return an array of row objects with keys from column 1.
			// (Duplicates are discarded.)
			if ( $this->last_result ) {
				foreach ( $this->last_result as $row ) {
					$var_by_ref = get_object_vars( $row );
					$key        = array_shift( $var_by_ref );
					if ( ! isset( $new_array[ $key ] ) ) {
						$new_array[ $key ] = $row;
					}
				}
			}
			return $new_array;
		} elseif ( ARRAY_A === $output || ARRAY_N === $output ) {
			// Return an integer-keyed array of...
			if ( $this->last_result ) {
				foreach ( (array) $this->last_result as $row ) {
					if ( ARRAY_N === $output ) {
						// ...integer-keyed row arrays.
						$new_array[] = array_values( get_object_vars( $row ) );
					} else {
						// ...column name-keyed row arrays.
						$new_array[] = get_object_vars( $row );
					}
				}
			}
			return $new_array;
		} elseif ( strtoupper( $output ) === OBJECT ) {
			// Back compat for OBJECT being previously case-insensitive.
			return $this->last_result;
		}
		return null;
	}

Changelog

Version Description
0.71 Introduced.

© 2003–2021 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wpdb/get_results