Is there any way (with php) to detect what username someone has logged onto there computer using? I'm making a chat script.

Is there any way (with php) to detect what username someone has logged onto there computer using? I'm making a chat script.
Lets set the stage on fire, and hollywood will be jealous.
Suppose it would be. Thanks anyway.
Lets set the stage on fire, and hollywood will be jealous.
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