php tokenisation

Question

我有一串由多个哈希(#)分隔的字符.我需要在php上的哈希之间得到单词.这是我的代码的样子:

$sql = "SELECT attribute_type.at_name,attribute_type.at_id FROM attribute_type 
WHERE attribute_type.prodType_id = $pt_id 
AND attribute_type.at_id NOT IN (SELECT at_id 
                                 FROM attribute_type 
                                 WHERE attribute_type.at_name = 'Product')";

        while($items. strpos("#")>0){
            // add the selected AT in every loop to be excluded
            // .
            // here tokens from $items are stored individually in 
            // $selectedAT (whose value changes in every loop/cycle)
            //
            // add to the current sql statement the values $at_id and $searchparam
            $sql = $sql .  "AND attribute_type.at_id NOT IN 
                           (SELECT at_id FROM attribute_type 
                            WHERE attribute_type.at_name = '$selectedAT')";
        }

        $dbcon = new DatabaseManager();
        $rs = $dbcon->runQuery($sql);

Answer 1

explode 通过在给定标记上拆分字符串来创建数组

$words = explode("#", $items);

现在,如果您需要从字符串中提取这些单词并使用它们来比较SQL查询中的某些列...

$sql = "SELECT ... WHERE column IN ('" . implode("', '", $words) . "')";

一旦在数组中包含单词,就不需要在循环中构建查询.

即使你确实想要这样做,你也不想为每个单词创建一个子查询,只要你可以在一个子查询中将单词组合在一起.