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modules: readme files regenerated - modules ... [skip ci]

Kamailio Dev authored on 27/02/2018 12:16:20
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@@ -77,6 +77,12 @@ Chapter 1. Admin Guide
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    Copy field 'field_name' from json object 'json_string' and store it in
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    pvar 'destination'.
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+   Note that the result is the string representation of that JSON filed.
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+   For example, if you want to retrieve a field that has a string value,
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+   then the result is the value enclosed in quotes. If the field value is
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+   a structure, then the result is the string-formatted representation of
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+   that structure.
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+
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    Example 1.1. json_get_field usage
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 json_get_field("{'foo':'bar'}", "foo", "$var(foo)");