Thinkphp $ _ GET String + filtered into spaces

Uid value. The string "+", $ _ GET is printed and filtered into spaces?

Uid value. The string "+", $ _ GET is printed and filtered into spaces?

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Uid value. The string "+", $ _ GET is printed and filtered into spaces?

No filtering occurs. normal URL parsing should be a space here.
For Base64 strings, because + exists, if you want to pass through the URL,
Either make sure that the + number in the URL is % 20, that is, replace the + number with % 20,
Either use the URLSafe Base64 encoding to replace +,/-,_

URL parsing is performed by urldecode
Echo urldecode ('+ ')