我正在尝试学习验证,下面是用户输入4个字段的表单,该字段用于验证用户的输入.

第一个问题：要让变量$a检查错误数组中是否有内容,应在哪里定义？

第二个问题：对于每个字段(产品名称/描述/猫/价格),我应该创建一个不同的数组来存储错误消息吗？

<?php

$productName = filter_has_var(INPUT_GET, 'pName') ? $_GET['pName']: null;
$desc = filter_has_var(INPUT_GET, 'description') ? $_GET['description']: null;
$cat = filter_has_var(INPUT_GET, 'category') ? $_GET['category']: null;
$pPrice = filter_has_var(INPUT_GET, 'price') ? $_GET['price']: null;

$productName = trim ($productName);
$desc = trim ($desc);
$cat = trim ($cat);
$pPrice = trim ($pPrice);

echo "<h1>Product details</h1>\n";

$nameerror = array();

if (empty($productName))
{ 
$nameerror[] = "You have not enter a Product";
}
elseif (strlen($productName) >50)
{
$nameerror[] = "Exceed product field length"; 
}
if (empty($desc))
{ 
$nameerror[] = "You have not enter description in the Description field";
}
elseif (strlen($desc) >100)
{
$nameerror[] = "Exceed descrption field length"; 
}
if (empty($cat))
{ 
$nameerror[] = "You have not enter category in the Category field";
}
if (empty($pPrice))
{ 
echo"<p>You have not enter price in the Price field</p>\n";
}
elseif (strlen($pPrice) >10)
{
echo"<p>Exceed price field length</p>\n"; 
}

if (!empty($nameerror))
for ($a=0;$a<count($nameerror);$a++)
{
    echo "$nameerror[$a] <br />\n";
}
else
{
echo "<p>Name: $productName</p>\n";
echo "<p>Description: $desc</p>\n";
echo "<p>Category: $cat</p>\n";
echo "<p>Price: $pPrice</p>\n";
}

?>

解决方法:

您的目的是收集表格中的所有错误并将这些错误告知用户.

一切都正确,除了在循环中使用错误的数组名称.它应该是：

for ($a=0;$a<count($nameerror);$a++)
{
    echo "$nameerror[$a] <br />\n";
}

第二个问题的答案是：否-您可以像已经完成的那样将所有错误消息存储在单个数组中.