Question

那里的所有答案都涉及迭代两个或多个相同长度的数组，或者使用相同的键，但不是这里。我尝试了所有的想法都无济于事。

我在同一个POST表单中提交了两个多项选择 - 购买的产品和未购买的产品。它们包含相同的产品，但由于多选择很少会在数组中产生相同的项目（想想有多少组合。）第一个foreach工作正常并从MySQL中获取所有选定的任何客户＆＃34;买＆＃34;项目。然而，第二个嵌套的foreach没有迭代 - 它只是从＆＃34; hasn＆ttt带来的第一个值＆＃34;阵列。

HTML部分：

Find customers who have bought:

<form method="post" action="">
<select name="bought[]" size="5" multiple="multiple">
<option value="RD"> Brown T Shirt </option>
<option value="RDX"> Red T Shirt </option>
<option value="HD"> White T Shirt </option>
<option value="CB"> Black T Shirt</option>
<option value="DA"> Green T Shirt </option>
</select>

But who haven't bought:

<select name="notbought[]" size="5" multiple="multiple">
<option value="RD"> Brown T Shirt </option>
<option value="RDX"> Red T Shirt </option>
<option value="HD"> White T Shirt </option>
<option value="CB"> Black T Shirt</option>
<option value="DA"> Green T Shirt </option>
</select>

<div class="buttons>
<button class="large" type="submit">Get the CSV!</button>
</div>
</form>

然后是PHP：

<?php
foreach($_POST['bought'] as $bought) {
foreach($_POST['notbought'] as $notbought){

$selectsubs = mysqli_query("SELECT First_Name, Last_Name, Email, Territory
                FROM Customers
                WHERE Customer_Type = 'Active'
                AND Products_Bought LIKE '%$bought%'
                AND Products_Bought NOT LIKE '%$notbought%'
                ");


 while($row = mysqli_fetch_assoc($selectsubs))  {

$csvWriter->addRow();
$csvWriter->addCol($row['Email']);
$csvWriter->addCol($row['First_Name']);
$csvWriter->addCol($row['Last_Name']);
$csvWriter->addCol($row['Territory']);
    }
  }
}
$csvWriter->writeFile("customers.csv");
?>

Answer 1

假设Products_Bought字段是以逗号分隔的产品列表，我很想在单个SQL中执行此操作，类似这样（未经测试）： -

foreach($_POST['bought'] AS $key=>$value) $_POST['bought'][$key] = mysqli_real_escape_string($con, $_POST['bought'][$key]);
foreach($_POST['notbought'] AS $key=>$value) $_POST['notbought'][$key] = mysqli_real_escape_string($con, $_POST['notbought'][$key]);

$bought = 'FIND_IN_SET("'.implode('", REPLACE(Products_Bought, "-", ",")) AND FIND_IN_SET("', $_POST['bought']).'", REPLACE(Products_Bought, "-", ","))';
$notbought = '!FIND_IN_SET("'.implode('", REPLACE(Products_Bought, "-", ",")) AND !FIND_IN_SET("', $_POST['notbought']).'", REPLACE(Products_Bought, "-", ","))';

$selectsubs = mysqli_query("SELECT First_Name, Last_Name, Email, Territory
            FROM Customers
            WHERE Customer_Type = 'Active'
            AND $bought
            AND $notbought");

这应该构建一个类似于以下内容的SQL： -

SELECT First_Name, Last_Name, Email, Territory
FROM Customers
WHERE Customer_Type = 'Active'
AND FIND_IN_SET("RD", REPLACE(Products_Bought, '-', ','))
AND FIND_IN_SET("RDX", REPLACE(Products_Bought, '-', ','))
AND !FIND_IN_SET("HD", REPLACE(Products_Bought, '-', ','))
AND !FIND_IN_SET("CB", REPLACE(Products_Bought, '-', ','))

然而，将购买的商品拆分到另一个表中可能会更好，每个客户/商品只有一行，而不是使用分隔列表。

迭代两个不同长度的POST阵列，找到购买x，y，z但没买x，y，x，z的客户

1 个答案: