只需检查变量是否包含值，如果它们包含，就可以像下面这样构建查询：
unset($sql);
if ($stationFilter) {
$sql[] = " STATION_NETWORK = '$stationFilter' ";
}
if ($verticalFilter) {
$sql[] = " VERTICAL = '$verticalFilter' ";
}
$query = "SELECT * FROM $tableName";
if (!empty($sql)) {
$query .= ' WHERE ' . implode(' AND ', $sql);
}
echo $query;
// MysqL_query($query);
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