Solution for php validating that session is invalid

In this paper, an example is given to explain the solution of php verifying session invalid. Share it for your reference. The specific methods are as follows:

1. Problems

Today, I tossed for a long time when configuring apache+php environment. Later, I succeeded, but I found that the verification code picture can be generated. When I logged in for verification, I found that session was empty and had no value.

2. Solutions

Environment: apache+php

The program code is as follows:

<input name="username" type="text" class="input" id="username">

<input name="password" type="password" class="input" id="password">

<input name="ver" type="text" class="input1" id="ver" size="5">

<img src="../inc/ver.php" onclick="this.src='../inc/ver.php';" />

Post-submission processing file post. php file

if($_SESSION['ssioner']!=$ssever){

echo("<script>alert(' The verification code must be defined by the 4 Bit number composition !');history.back();</script>");exit;  

}

The results show that the 1 direct prompt verification code must be composed of 4 digits, and then print out session:

echo $_SESSION['ssioner'];

exit;

1 straight empty, then I thought of session environment configuration 1 session file directory, now we find php. ini configuration file found
upload_tmp_dir
Found that this directory is
upload_tmp_dir="D:\www.ofstack.com\tp"
I checked my D disk 1 and found that there were only www. ofstack. com files but no tp directory, so the problem was found. When I created an tp directory, I restarted apache and found that there were sess_i40gl0p4hfep5r69j67o1k26d01 files in tp directory.

I hope this article is helpful to everyone's PHP programming.