symfony - How to get params in twig file -

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how can use $_get params in twig file using php , alerting js.

uri-> ?comment=added...

in twig,

    if($_get['comment'] == "added"){      ...echo '<script>alert("in twig file!");</script>';     }

hope you

{% if app.request.get('comment') == "added" %}     <script>alert("in twig file!");</script> {% endif %}

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