Php/docs/function.taint
From Get docs
taint
(PECL taint >=0.1.0)
taint — Taint a string
Description
taint
( string &$string
, string ...$strings
) : bool
Make a string tainted. This is used for testing purpose only.
Parameters
string
strings
Return Values
Return TRUE if the transformation is done. Always return TRUE if the taint extension is not enabled.