system/Database/MySQLi/Result.php
public function getFieldNames(): array
	{
		$fieldNames = [];
		$this->resultID->field_seek(0);
		while ($field = $this->resultID->fetch_field())
		{
			$fieldNames[] = $field->name;
		}

		return $fieldNames;
	}
public function getFieldNames(): array
	{
		$fieldNames = [];
		$this->resultID->field_seek(0);
		while ($field = $this->resultID->fetch_field())
		{
			$fieldNames[] = $field->name;
		}

		return $fieldNames;
	}
Generates an array of column names in the result set.

@return array