Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Specifies the color of a background rectangle to place under text annotations.
Parameters
- under_color
the under color
Return Values
No value is returned.
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