Why is the session value incorrect?

Source: Internet
Author: User
I want to print out the session value on the yzm1.php page. Why is the session value different from the image? Every time you refresh the yzm1.php page, the printed string is the same as the string on the image before the page refresh, that is, it appears on the image... I want to print out the session value on the yzm1.php page to see why.
Is the session value different from the image value? Every time you refresh the yzm1.php page, the printed strings are the same as the strings on the image before the page is refreshed, that is, the echo $ _ SESSION ["aaa"] value after a refresh. why are they different? How can I perform verification?

Yzm1.php


          

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