Learning bound variables ??

[Gavin Chalkley <gavin.chalkley@xxxxxxxxx>]

Afternoon all.

I am learning the base php at the moment and have come across scripting 
that has the following examples:

"|header("Location: ".$this->referrer);"

Could someone point me in a direction to learn about this osrt of thing?

Or could some explain?

Best regards,

Gavin||
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