在php中插入数据库后刷新到数据发布页面

Question

Suppose I have three pages in php: Page1, Page2 and Page3.

1. Page1 has a link (anchor tag) with a variable. Suppose in the anchor tag href is like- href="Page2.php?id='$myid'" , where $myid has been posted in a variable id to the Page2.php if I click that link.
2. In the Page2.php I have a variable suppose $newid where I am storing the id variable (ie posted from Page1.php) using GET. It is like- $newid=$_GET['id']; . In this page I am posting some input data to Page3.php using a submit button.
3. In Page3.php, my posted data are inserted to my database ( mySql ) correctly.

Now my question is, after successful insertion of data to the database in Page3.php, how can I revert back to Page2.php since there is a variable id from Page1.php ( $newid=$_GET['id']; ) using a javascript message box. Even I have stored that $newid to a SESSION variable also in Page2. Please help.

Answer 1

Assuming you want to manipulate the PHP variable in JavaScript or run logic against it, I would recommend making use of the HTML DOM itself as an intermediary point.

First, echo the PHP variable somewhere on the page:

<span id="php">
  <?php echo $newid; ?>
</span>

This output location can be hidden with CSS if need be.

#php {
  display: none;
}

Then, target the element with JavaScript:

var id = document.getElementById('php').innerHTML;

You can then manipulate the variable as you would like, running conditional logic, and redirecting accordingly:

 var id = document.getElementById('php').innerHTML; if (id == 2) { // Logic triggers window.location = "page1.php?id=" + id; } 

 <span id="php">2</span> 

The above example will pass the id parameter as $_GET to page 1.

However, it's important to note that $_SESSION data persists between pages, so you could always just use $_SESSION['id'] directly, from any of your pages.

Hope this helps! :)