使用PHP的session_start（）; 不止一次？ 它会清除过去的会话变量吗？ [重复]

Question

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• Is there any harm in running session_start() multiple times as the page request is being built (in php)? 8 answers

I'm currently developing in PHP, and I need to know if using

<?php session_start(); ?>

More than once in a script, or on a page/site will clear the variables or have any effect? If so how can I use this dynamically?

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Answer 1

From the PHP docs:

As of PHP 4.3.3, calling session_start() after the session was previously started will result in an error of level E_NOTICE. Also, the second session start will simply be ignored.