php - PDO 绑定(bind) n 次与 foreach 相同的值

Question

我在 PHP 中有一个函数，它应该在 MySQL IN 语句中绑定(bind)那么多变量，即在数组中。我的问题是变量和键正在改变，但函数只绑定(bind)最后一个值 n 次。

我不知道问题出在哪里......

这是我的类方法:

public function getOtListByOtNumbers($conditions){
        $data_array = $conditions[SEARCH_OT];
    # To find last key (remove coma)
        $quantity = count($data_array);
        $marks = '';
    # Bind name string && rewriting value as integer
        foreach ($data_array as $key => $value){
            $i = $key+1;
            if ($i == $quantity){
                $marks .= ':key'.$i;
            }
            else {
                $marks .= ':key'.$i.', ';
            }
        }
    # Query
        $sql="
        SELECT
            c_int_id,
            c_ot,
            c_tickets_amount,
            c_basket_value,
            c_person,
            c_company,
            c_city,
            c_package_number,
            c_delivery_method,
            c_ot_date,
            c_email,
            c_phone,
            c_comment,
            c_send
        FROM ws_orders
        WHERE c_ot IN (".$marks.")
        ORDER BY c_int_id DESC
        LIMIT :first, :last ";
        $stmt = $this->PDO->prepare($sql);

    # Bind n values
    // Here is a problem
        var_dump($data_array); // var dump 1
         foreach ($data_array as $key => $param){
            $key_number = $key +1;
            $key_name = 'key'.$key_number;
            $stmt->bindParam($key_name, $param, PDO::PARAM_INT);
            var_dump($key_name); // var dump 2
            var_dump($param); // var dump 3
        }

    # Bind limit values
        $stmt->bindParam('first', $conditions[OT_SEARCH_FIRST_ROW], PDO::PARAM_INT);
        $stmt->bindParam('last', $conditions[OT_SEARCH_ROW_LIMIT], PDO::PARAM_INT);

    # If executed return result
        if ($stmt->execute() != FALSE) {
            $stmt_result = $stmt->fetchAll();
            $stmt->closeCursor();
            var_dump($stmt_result); // var dump 4

    # If not executed print debug and return FALSE
        } else {
            var_dump($stmt->errorInfo());
            $this->debugQuery($stmt);
            $stmt_result = FALSE;
        }

        return $stmt_result;
    }

这里是 var dupms:

变量转储 1

array (size=2)
 0 => string '2761531'
 1 => string '2760650'

var 转储 2 和 3

string 'key1' (length=4)

string '2761531'

string 'key2' (length=4)

string '2760650'

此次执行的 SQL 查询

        SELECT
            c_int_id,
            c_ot,
            c_tickets_amount,
            c_basket_value,
            c_person,
            c_company,
            c_city,
            c_package_number,
            c_delivery_method,
            c_ot_date,
            c_email,
            c_phone,
            c_comment,
            c_send
        FROM ws_orders
        WHERE c_ot IN ('2760650', '2760650')
        ORDER BY c_int_id DESC
        LIMIT 0, 30

那么我做错了什么？

编辑

---

---

---

所以我做到了 ;)问题出在 foreach

代替:

     foreach ($data_array as $key => $param){
        $key_number = $key +1;
        $key_name = 'key'.$key_number;
        $stmt->bindParam($key_name, $param, PDO::PARAM_INT);
        var_dump($key_name); // var dump 2
        var_dump($param); // var dump 3
    }

我给:

        for ($key_number = 0; $key_number < $quantity + 1; $key_number++) {
            $key_name = 'key'.$key_number;
            $stmt->bindParam($key_name, $data_array[$key_number], PDO::PARAM_INT);
        }

它可以工作，但我仍然不知道之前的 foreach 有什么问题...

Answer 1

PDO::bindParam()之间是有区别的和 PDO::bindValue() . PDO::bindParam 绑定(bind)引用，而不是值。当 foreach 进程结束时，$param 将引用最后一个数组值。在 execute 调用时，所有绑定(bind)的引用都将被评估为相同的值。

官方 PDO::bindParam 文档说:

Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

如果您想在 foreach 中绑定(bind)值，请使用 PDO::bindValue。