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JSON_DECODE(varname,item[,separator[,options]])

varname - The name of the variable containing the JSON string to parse.
item - The name of the key whose value to return.
Multiple keys can be listed separated by a hierarchy delimeter, which will recursively index into a nested JSON string to retrieve a specific subkey's value.
separator - A single character that delimits a key hierarchy for nested indexing. Default is a period (.)
This value should not appear in the key or hierarchy of keys itself, except to delimit the hierarchy of keys.
options
- c - For keys that reference a JSON array, return the number of items in the array.
  This option has no effect on any other type of value.

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