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我已经尝试调试这个脚本一个月了。程序的其余部分已经构建好了，这一点就行不通了。问题是 $query 变量，除非我硬编码，否则它会返回 null - 这对于搜索表单是不可能的。我试过添加'\n'，我试过只输入返回值，我已经将“更改为”一开始。我已经测试了这个块之外的其余代码并且一切正常。我已经在这个块上运行了测试，你可以从下面注释掉的 echo 语句中看到。这些测试都很好。由函数构建的 $query 字符串在硬编码或在数据库浏览器中返回正确的数据。我被卡住了！请帮忙。

[代码片段]

if(isset($_POST['submit'])) {

    // define the list of fields
    $fields = array('lastname', 'firstname', 'dob', 'city', 'telephone', 'email', 'user_id');
    $conditions = array();


    // loop through the defined fields
    foreach($fields as $field){
        //echo "Field is ".$field."\n";
        // if the field is set and not empty
        if(isset($_POST[$field]) && $_POST[$field] != '') {
              //echo "Field is: ".$field."\n".$field." is: ".$_POST[$field]."\n";            
            // create a new condition while escaping the value inputed by the user (SQL Injection)
            $conditions[] = "$field LIKE '%" . mysql_real_escape_string($_POST[$field]) . "%' 
            ";
        }
    }

    // builds the query
    $query = "\"
    SELECT * 
    FROM wp_ct_ad_client_db_table
    ";

    // if there are conditions defined
   $query_user_id = "user_id = ".$user_id."
   \"";
    array_push($conditions, $query_user_id);

    if(count($conditions) > 0) {
        // append the conditions
        $query .= "WHERE " . implode(' AND ', $conditions); // you can change to 'OR', but I suggest to apply the filters cumulative
    }

    echo "Query String: ".$query."\n";

    //$result = $wpdb->get_results($query);
    $my_query = $query;

    echo "Test My Query Logic \n";
    //$result = $wpdb->get_results("SELECT * FROM wp_ct_ad_client_db_table WHERE lastname LIKE '%A%' AND user_id = $user_id;");
    //$result = $wpdb->get_results($my_query);
    $result = $wpdb->get_results($my_query, A_ARRAY);

    var_dump($result);

[/代码片段]

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