======Synopsis:======
[[json_implode]](<<var>>)

======Technical:======
This function serialises an assign variable structure into a [[http://json.org/|JSON]] string.

All sub-structures are stored as JSON sub-objects, and all assign values are stored as JSON string values.  If a part of the structure is both a sub-structure and has an assign value, the sub-structure is stored. Only global assign structures can be serialised.

An assign variable structure can be losslessly round-tripped through [[json_implode]] and [[json_explode]], so this function is a good way for a script to serialise state to a file and reconstruct it later.

If the function fails, an empty string is returned.

======Returns:======
|<<string>>|The JSON serialised form of the structure <<var>>.|
|<<empty>>|The function failed (probably because <<var>> is not a structure).|

======Examples:======

  @ foo[client] = [EPIC]
  @ foo[details][description] = [EPIC rocks!]
  @ foo[details][protocol] = [IRC]
  @ foo[details][port] = 6667
  
  echo $json_implode(foo)
  
======See Also:======
[[json_error]], [[json_explode]]