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+======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]]