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PHP Manual

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

The following constants indicate the type of error returned by json_last_error(). They are all available as of PHP 5.3.0.

`JSON_ERROR_NONE` (integer)
  No error has occurred.
`JSON_ERROR_DEPTH` (integer)
  The maximum stack depth has been exceeded.
`JSON_ERROR_CTRL_CHAR` (integer)
  Control character error, possibly incorrectly encoded.
`JSON_ERROR_SYNTAX` (integer)
  Syntax error.

Resource Types
JSON Functions
JSON
PHP Manual