PHP将变量从页面转移到另一个页面

Question

i have 4 pages like below:

page1

session_start();
<input type="text" name="log1" value="".$_SESSION["log1"]."">

page2

session_start();
$_SESSION["log1"] = $_POST["log1"] 
<input type="text" name="log2" value="".$_SESSION["log2"]."">

page3

session_start() 
$_SESSION["log2"] = $_POST["log2"] 
<input type="text" name="log2" value="".$_SESSION["log3"]."">

page4

session_start();
$_SESSION["log3"] = $_POST["log3"] 
<input type="text" name="log2" value="".$_SESSION["log4"]."">

i transfer with method post in order page1 > page2 > page3 > page4 . if i return to page2, i not have $_SESSION["log2"] in value of input And displays it an empty field. Where is the problem?

Answer 1

You're using bad syntax for using PHP with HTML. Instead of:

session_start();
$_SESSION["log1"] = $_POST["log1"] 
<input type="text" name="log2" value="".$_SESSION["log2"]."">

Use:

<?php
session_start();
$_SESSION["log1"] = $_POST["log1"];
?>
<input type="text" name="log2" value="<?php echo $_SESSION["log2"]; ?>">

Also make sure to use form to post data to another page to set session variables.