PHP会话不存储值

Question

First page abc.html

< form action="xyz.php" method="post" >
< input type=text value="ABC" name="first" id="first" />
< /form>

Second page xyz.php

session_start();

$var1 = $_Request['first'];
$_Session['myvar'] = $var1;
session_write_close();

echo "<a href='lkj.php'>click here</a>"

third page lkj.php

session_start();

echo $_Session['var1'];

and the output comes nothing, its totally blank as there was nothing stored in the session variable.
Can you please help me out with this?

Answer 1

Your case is incorrect, and variable identifiers are case sensitive in PHP:

// Incorrect:
$var1 = $_Request['first'];
$_Session['myvar'] = $var1;
session_write_close();

// Should be:
$var1 = $_REQUEST['first'];
$_SESSION['myvar'] = $var1;
session_write_close();


// On lkj.php:
session_start();
echo $_SESSION['var1'];

Also, instead of using $_REQUEST I highly recommend using $_POST . Your form specifies method='post' .

$var1 = $_POST['first'];
$_SESSION['myvar'] = $var1;

Answer 2

There are a few issues that I'm seeing with the code you provided.

1. You are referencing your variables incorrectly. On xyz.php you are setting $_Session['myvar'] = $var1; and then on ljk.php you are trying to echo $_Session['var1'] which wouldn't exist, as it has not been set. The variable that you would want to access would be $_SESSION['myvar'] , as that was the variable that was set in xyz.php .

2. You want to utilize $_SESSION , not $_Session .

3. You are using $_REQUEST which is a superglobal and can raise some security concerns. While your code may not be affected for its current purpose, its always a better idea to just avoid it. Instead utilize $_POST as that will only take the data that has been posted.