How to concatenate a variable to a string in smarty? -

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मैंने चतुर कोड का पालन किया है: 

  {foreach = $ preview_data key = key आइटम = मान}

मैं एक इकाइयों _ स्ट्रिंग को वैरिएबल $ की में समाहित मान को जोड़ना चाहता हूं। मैं कोड के ऊपर की कोशिश की लेकिन यह काम नहीं किया। यह कैसे प्राप्त करें?

$ की सिर्फ एक चर है, एक ही वाक्यविन्यास का उपयोग करें: 

  & lt; input type = "hidden" class = "form-control" name = "units _ {$ key}" id = "यूनिट _ {$ key}" value = "{$ value.units}" & gt ;

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