尝试获取所有发布变量，并遍历它们以查看它们是否有效，然后构建查询
<?PHP
$id = $_POST[id];
$field1 = $_POST[field1];
$field2 = $_POST[field2];
$field3 = $_POST[field3];
$whereArr = array();
if($id != "") $whereArr[] = "id = {$id}";
if($field1 != "") $whereArr[] = "field1 = {$field1}";
if($field2 != "") $whereArr[] = "field2 = {$field2}";
if($field3 != "") $whereArr[] = "field3 = {$field3}";
$whereStr = implode(" AND ", $whereArr);
$query = "Select * from assignments WHERE {$whereStr}";
这样的事情应该可以满足您的需求
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