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json_decode_with_error

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

json_decode, but populates $error in case of error

function json_decode_with_error(
  string $json,
  inout ?(int, string) $error,
  bool $assoc = false,
  int $depth = 512,
  int $options = 0,
): mixed;

If the function runs normally with no errors, then $error is set to null. Otherwise, if an error occurs, $error is set to a tuple of (error code constant, description) from the list defined in builtins_json.hhi.

Parameters​

  • string $json
  • inout ?(int, string) $error
  • bool $assoc = false
  • int $depth = 512
  • int $options = 0

Returns​

  • mixed