wpdb::set_prefix( string $prefix, bool $set_table_names = true ): string|WP_Error

Source

public function set_prefix( $prefix, $set_table_names = true ) {

	if ( preg_match( '|[^a-z0-9_]|i', $prefix ) ) {
		return new WP_Error( 'invalid_db_prefix', 'Invalid database prefix' );
	}

	$old_prefix = is_multisite() ? '' : $prefix;

	if ( isset( $this->base_prefix ) ) {
		$old_prefix = $this->base_prefix;
	}

	$this->base_prefix = $prefix;

	if ( $set_table_names ) {
		foreach ( $this->tables( 'global' ) as $table => $prefixed_table ) {
			$this->$table = $prefixed_table;
		}

		if ( is_multisite() && empty( $this->blogid ) ) {
			return $old_prefix;
		}

		$this->prefix = $this->get_blog_prefix();

		foreach ( $this->tables( 'blog' ) as $table => $prefixed_table ) {
			$this->$table = $prefixed_table;
		}

		foreach ( $this->tables( 'old' ) as $table => $prefixed_table ) {
			$this->$table = $prefixed_table;
		}
	}
	return $old_prefix;
}

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