Question

我的sql应该打印两行。

id符号共享 3 CSCO 40 3 FB 200

但此代码仅打印第一行两次。像这样： jharvard拥有40股CSCOjharvard股份，拥有40股CSCO

为什么？

先谢谢你。

$users = query("SELECT * FROM users WHERE id = ?", $_SESSION["id"]);   
$rows = query("SELECT * FROM stocks WHERE id = ?", $_SESSION["id"]);

$stock = $rows[0];
$username = $users[0];

foreach ($rows as $row)
{
if( $stock["id"] === $_SESSION["id"])
{
print("<td>" . $username["username"] . "   has   "  . $stock["Shares"] .   "   shares of   "   . $stock["Symbol"] . "</td>");
}
}

Answer 1

原因是你的变量在循环中

foreach ($rows as $row) {
    if( $stock["id"] === $_SESSION["id"]) {
        print("<td>" . $username["username"] . "   has   "  . $stock["Shares"] .   "   shares of   "   . $stock["Symbol"] . "</td>");
    }
}

您正在打印您之前定义的$stock的值：

$stock = $row[0];

因此始终输出第一行的数据。

我怀疑你想改变你的循环如下：

foreach ($rows as $row) {
    // Changed from $stock['id'] to $row['id']
    if( $row["id"] === $_SESSION["id"]) {
        // Changed from $stock['Shares'] and ['Symbol'] to $row['Shares'] and ['Symbol']
        print("<td>" . $username["username"] . "   has   "  . $row["Shares"] .   "   shares of   "   . $row["Symbol"] . "</td>");
    }
}

为什么我只从我的sql打印一行？

1 个答案: