Whether there should be exit_PHP tutorials after phpheader

Whether exit exists after phpheader. After phpheader, do you need to write exit to terminate the program? I didn't care too much about it before. today I encountered a bug and found this problem. I wrote a code segment to test it, code such as php header whether to write exit to terminate the program has never been too concerned, today encountered a bug, only to find this is a problem, specially write a code segment to test, the code is as follows:

 
It turns out that if the php file encounters a header ("Location: a page URL") during running, it will jump directly to another page, however, the redirection does not affect the execution of the current php file. That is to say, after the php header jump, the script on the current page will continue to be executed. To terminate the script, add exit () or die ().
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