The function adds a warning message with the specified text to the global array of messages of type MSG_WARNING according to its ID.
Syntax
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Parameters
msg
A string value with a message test.
id
A string value with the identifier of the warning message.
Returns
Nothing.
Remarks
The message will remains in the array until it is removed from it explicitly. I.e. it doesn't disappear once displayed.
Include: pm.php.