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The amazing disappearing and reappearing patch... This time with documentation explaining it.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6821 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
2005-10-18 19:16:13 +00:00
parent a16432e294
commit eace0101f2
2 changed files with 37 additions and 1 deletions
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28
doc/README.variables
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@@ -66,6 +66,34 @@ value "blabla".
In fact, everything contained ${here} is just replaced with the value of
the variable "here".
____________________
VARIABLE INHERITANCE
--------------------
Variable names which are prefixed by "_" will be inherited to channels
that are created in the process of servicing the original channel in
which the variable was set. When the inheritance takes place, the
prefix will be removed in the channel inheriting the variable. If the
name is prefixed by "__" in the channel, then the variable is
inherited and the "__" will remain intact in the new channel.
In the dialplan, all references to these variables refer to the same
variable, regardless of having a prefix or not. Note that setting any
version of the variable removes any other version of the variable,
regardless of prefix.
Example:
Set(__FOO=bar) ; Sets an inherited version of "FOO" variable
Set(FOO=bar) ; Removes the inherited version and sets a local
; variable.
However,
NoOp(${__FOO}) is identical to NoOp(${FOO})
_______________________________
REMOVING CHARACTERS FROM STRING
-------------------------------