无法在html文本框中显示0值

Question

我使用php显示来自mysql的数据。 您可以看到当前余额的值为0 但在编辑模式下，它无法显示0

执行更新声明之前

我从相应的$ _POST变量

声明其变量

if (!empty($_POST)) {

    $ID = $_POST['ID'];
    $Name = $_POST['Name'];
    $AID = $_POST['AID'];
    $CurrentBalance = $_POST['CurrentBalance'];

    $valid = true;

    if ($valid) {
        $setsu = dbSetsuzoku();
        $setsu->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $sql = "UPDATE tabledb SET ID = ?, Name = ?, AID=?, CurrentBalance=? WHERE SubAgentID = ?";
        $q = $setsu->prepare($sql);
        $q->execute(array($ID,$Name,$AID,$CurrentBalance,$ID));
        $setsu = null;
    }
} 
 else {
    $setsu = dbSetsuzoku();
    $setsu->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "SELECT * FROM tabledb where ID = ?";
    $q = $setsu->prepare($sql);
    $q->execute(array($ID));
    $data = $q->fetch(PDO::FETCH_ASSOC);
    $ID = $data['ID'];
    $Name = $data['Name'];
    $AID = $data['AID'];
    $CurrentBalance = $data['CurrentBalance'];
    $setsu = null;
}

html（编辑模式）

<input name="CurrentBalance" type="text" placeholder="CurrentBalance" value="<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>" required />

其他字段遵循相同的逻辑

Answer 1

问题是：

<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>

对于空函数0被视为空 - 只需查看http://au2.php.net/manual/en/function.empty.php

您可以将其更改为：

<?php echo isset($CurrentBalance)?$CurrentBalance:'';?>

Answer 2

如果你查看empty（）函数的文档，你会看到它会为0返回true。因此你只需在这里显示一个空字符串：

<input name="CurrentBalance" type="text" placeholder="CurrentBalance" value="<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>" required />

简单的解决方法是将空的搅拌变为0。