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Document combining JSON constants

Working out how to do this took Slack and StackOverflow. Documenting so others know what to do.

Peter Bowyer authored on 12/10/2018 08:40:00 • Fabien Potencier committed on 12/10/2018 12:51:35
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@@ -15,7 +15,9 @@ Arguments
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 * ``options``: A bitmask of `json_encode options`_ (``{{
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-  data|json_encode(constant('JSON_PRETTY_PRINT')) }}``)
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+  data|json_encode(constant('JSON_PRETTY_PRINT')) }}``. Combine constants using `Twig's bitwise operators`: ``{{
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+  data|json_encode(constant('JSON_PRETTY_PRINT') b-or constant('JSON_HEX_QUOT') }}``)
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 .. _`json_encode`: https://secure.php.net/json_encode
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 .. _`json_encode options`: https://secure.php.net/manual/en/json.constants.php
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+.. `Twig's bitwise operators`: https://twig.symfony.com/doc/2.x/templates.html#logic