我们需要创建一个程序，让用户 input 获得数组大小、他们的姓名和年龄（取决于用户输入的数组大小）。之后，我们需要显示数组的所有元素。
这是我的代码，但我在为另一个用户添加新元素并显示它时遇到问题。
<html>
<head>
<title> PHP Array </title>
</head>
<body>
<form method="post" action="example.php">
<h3> Please enter the your information: </h3>
Array Size: <input type="text" name="arraysize"/> <br/><br>
Name: <input type="text" name="name" /><br/><br/>
Age: <input type="text" name="age"/> <br/><br/>
<input type="submit" name="submit" value="Submit"/>
<input type="reset" name="cancel" value="Cancel"/><br/><br/>
<?php
if(isset($_POST['submit'])){
if((!empty($_POST['name'])) && (!empty($_POST['age'])) && (!empty($_POST['arraysize']))){
$info = array($_POST['arraysize'], $_POST['name'], $_POST['g6ave']);
$arraylength = count($info);
for ($i=0; $i<=$arraylength ; $i++) {
$name = $_POST['name'];
for ($j=1; $j<=$i; $j++){
echo "User's Name" .$i. ": " .$name. [$j] ."<br>";
$age = $_POST['age'];
for($k=0; $k<=$i; $k++){
echo "User's Age: " .$age. [$k] ."<br/>";
}
}
}
}
}
?>
</body>
</html>回答1
下面的一种方法（其他可能的方法）应该给你主要的想法。我还评论了每个脚本部分的目的。
下面的方法假定您将为所有表单页面使用相同的 URL。 （第 1、第 2 和成功页面）
我希望这有帮助。
session_start(); //Start new or resume existing session
if (isset($_SESSION['form_success']) && $_SESSION['form_success'] === true)
{
require 'success_page.php';
unset($_SESSION['form_success']); // don't needed anymore
return; //not to continue to execute the code
}
// decide the page from user
if (isset($_POST['page']))
{
$page = $_POST['page'];
}
else
{
// display the first form page for the 1st time
require 'first_page_form.php';
return; //not to continue to execute the code
}
// if the first page was submitted.
if ($page === 'first') // or a specific POST flag from 1st page
{
//verify data from first page
$warnings = [];
if (first_page_data_valid() === true)
{
require 'second_page_form.php';
return; //not to continue to execute the code
}
// populate $warnings during first_page_data_valid()
//if first page data are invalid
print_r($warnings);
require 'first_page_form.php'; //display again
return; //not to continue to execute the code
}
// if the second page was submitted.
if ($page === 'second') // or a specific POST flag from 2nd page
{
//verify data from second page
$warnings = [];
if (second_page_data_valid() === true) // populate $warnings during second_page_data_valid()
{
// do things. ex: DB operations.
if (db_actions_success() === true)
{
$_SESSION['form_success'] = true; // defined and set to true.
// PHP permanent URL redirection. usage of 301 is important.
// it clears POST content. Prevents F5/refresh.
header("Location: https://www.url.com/form.php", true, 301);
exit; // good/recommended to use after redirect
}
else
{
echo 'System down or I have a bug. Try again later.';
return; //not to continue to execute the code
}
}
//if second page data is invalid
print_r($warnings);
require 'second_page_form.php'; //display again
return; //not to continue to execute the code
}