php中如何实现多个搜索过滤器

Question

我正在尝试在 php 和 mysql 中实现过滤器以搜索数据库中的记录....如果在 6 个过滤器中只有两个被选中，过滤器应该是这样的，查询将对这两个执行“AND”操作并从数据库中获取数据，如果三个则它将对这三个过滤器执行“AND”操作……一种实现方法是检查每个过滤器。

if (isset($_GET['name'] && isset($_GET['city'])) { 
    // perform AND for these two
} elseif(isset($_GET['name'] && (isset($_GET['age'])) {
    // perform AND for these three
}

// and so on ...

但问题是，如果我有 6 个过滤器，那么我必须为其创建 64 种组合……我在考虑是否存在其他解决方案？

Answer 1

假设您的$_GET键与表中的列匹配，这可能会起作用：

$query = "SELECT * FROM table";

$filtered_get = array_filter($_GET); // removes empty values from $_GET

if (count($filtered_get)) { // not empty
    $query .= " WHERE";

    $keynames = array_keys($filtered_get); // make array of key names from $filtered_get

    foreach($filtered_get as $key => $value)
    {
       $query .= " $keynames[$key] = '$value'";  // $filtered_get keyname = $filtered_get['keyname'] value
       if (count($filtered_get) > 1 && (count($filtered_get) > $key)) { // more than one search filter, and not the last
          $query .= " AND";
       }
    }
}
$query .= ";"

$query = "SELECT * FROM table WHERE name = 'name' AND city = 'city' AND age = 'age';"

我认为这可能有效，尽管此代码示例不包括针对 SQL 注入的清理，因此您可能应该添加一些内容来清除潜在危险的输入

更新：添加$filtered_get = array_filter($_GET); 从$_GET数组中过滤掉任何空字段

Answer 2

single if condition to check value is empty or not.for non-empty then mysql query is two between 'AND' operation.
$query = 'select * from info';
$where = ' Where';
$and = 'id = 1';
if(!empty($_GET['name'])){
  $and .= ' AND name="test"';
}
if(!empty($_GET['city'])){
  $and .= ' AND city="test"';
}
$q = $query.''.$where.''.$and;
make like this query is 'select & from info where id=1 AND name="test" AND city="test"';

Answer 3

您可以为表单元素使用前缀，例如 filter-，因此项目看起来像 filter-age、filter-name 等。 现在，让我们假设你有一个像

function buildFilters($input, $delimiter) {
    foreach ($input as $key => $value) {
        $filters = array();
        $filters[]="1=1";//default filter
        if (strpos($key, $prefix) === 0) {
            //add the filter to $filters via $filters[]=yourvalue
        }
    }
    return implode($delimiter, $filters);
}

然后你可以称之为

$myFilters = buildFilters($_POST, " AND ");

Answer 4

我尝试使用@tshimkus 的答案。 也许这是我设置阵列的方式或其他方式，但在让它工作之前我遇到了一些问题。

这一行：

$query .= " $keynames[$key] = '$value'";

对我来说需要：

$query .= " $key = '$value'";

我也没有收到最后一项工作的支票（如下所示）。

if (count($filtered_get) > 1 && (count($filtered_get) > $key)) { // more than one search filter, and not the last

最终使用了一个计数代替：

if($i!==$len){

Answer 5

$whereClause = '  ';
  
    if ( !empty($_POST['gender']) || !empty($_POST['hobby']) || !empty($_POST['search_filter']) ) {
    
    $whereClause .= ' WHERE ';
    if ( !empty($_POST['gender']) && !empty($_POST['hobby']) && !empty($_POST['search_filter']) ) {
        $whereClause .= ' gender = "'.$_POST['gender'].'" AND gender = "'.$_POST['gender'].'" AND search_filter LIKE "%'.$_POST['search_filter'].'%" ';

    } else {

        if ( !empty($_POST['gender']) && $_POST['gender'] != "" && empty($_POST['hobby']) && empty($_POST['search_filter']) ) {
            $whereClause .= ' gender = "'.$_POST['gender'].'"  ';          
        }
        else if ( (!empty($_POST['gender']) && $_POST['gender'] != "") &&  (!empty($_POST['hobby']) || !empty($_POST['search_filter']))) {
            $whereClause .= ' gender = "'.$_POST['gender'].'"  '; 
            $whereClause .= ' AND ';
        }
        
        if ( !empty($_POST['hobby']) && $_POST['hobby'] != "" && empty($_POST['gender']) && empty($_POST['name'])){
            $whereClause .= ' hobby = "'.$_POST['hobby'].'"  ';           
        }
        else if ( (!empty($_POST['hobby']) && $_POST['hobby'] != "") &&  (!empty($_POST['gender']) || !empty($_POST['search_filter']))) {
            $whereClause .= ' hobby = "'.$_POST['hobby'].'"  '; 
            $whereClause .= ' AND ';
        } 
        
        if ( !empty($_POST['search_filter'])) {
            $whereClause .= ' search_filter LIKE "%'.$_POST['search_filter'].'%"  ';       
        }    
    }

}