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 or stored as the code
of a JsonException.
-
JSON_ERROR_NONE
(int)
-
No error has occurred.
-
JSON_ERROR_DEPTH
(int)
-
The maximum stack depth has been exceeded.
-
JSON_ERROR_STATE_MISMATCH
(int)
-
Occurs with underflow or with the modes mismatch.
-
JSON_ERROR_CTRL_CHAR
(int)
-
Control character error, possibly incorrectly encoded.
-
JSON_ERROR_SYNTAX
(int)
-
Syntax error.
-
JSON_ERROR_UTF8
(int)
-
Malformed UTF-8 characters, possibly incorrectly encoded.
-
JSON_ERROR_RECURSION
(int)
-
The object or array passed to json_encode include
recursive references and cannot be encoded.
If the
JSON_PARTIAL_OUTPUT_ON_ERROR option was
given, null will be encoded in the place of the recursive reference.
-
JSON_ERROR_INF_OR_NAN
(int)
-
The value passed to json_encode includes either
NAN
or INF.
If the JSON_PARTIAL_OUTPUT_ON_ERROR option was
given, 0 will be encoded in the place of these
special numbers.
-
JSON_ERROR_UNSUPPORTED_TYPE
(int)
-
A value of an unsupported type was given to
json_encode, such as a resource.
If the
JSON_PARTIAL_OUTPUT_ON_ERROR option was
given, null will be encoded in the place of the unsupported value.
-
JSON_ERROR_INVALID_PROPERTY_NAME
(int)
-
A key starting with \u0000 character was in the string passed to
json_decode when decoding a JSON object into a PHP
object.
-
JSON_ERROR_UTF16
(int)
-
Single unpaired UTF-16 surrogate in unicode escape contained in the
JSON string passed to json_decode.
The following constants can be combined to form options for
json_decode.
-
JSON_BIGINT_AS_STRING
(int)
-
Decodes large integers as their original string value.
-
JSON_OBJECT_AS_ARRAY
(int)
-
Decodes JSON objects as PHP array. This option can be added automatically
by calling json_decode with the second parameter
equal to
true.
The following constants can be combined to form options for
json_encode.
-
JSON_HEX_TAG
(int)
-
All < and > are converted to \u003C and \u003E.
-
JSON_HEX_AMP
(int)
-
All & are converted to \u0026.
-
JSON_HEX_APOS
(int)
-
All ' are converted to \u0027.
-
JSON_HEX_QUOT
(int)
-
All " are converted to \u0022.
-
JSON_FORCE_OBJECT
(int)
-
Outputs an object rather than an array when a non-associative array is
used. Especially useful when the recipient of the output is expecting
an object and the array is empty.
-
JSON_NUMERIC_CHECK
(int)
-
Encodes numeric strings as numbers.
-
JSON_PRETTY_PRINT
(int)
-
Use whitespace in returned data to format it.
-
JSON_UNESCAPED_SLASHES
(int)
-
Don't escape
/.
-
JSON_UNESCAPED_UNICODE
(int)
-
Encode multibyte Unicode characters literally (default is to escape as
\uXXXX).
-
JSON_PARTIAL_OUTPUT_ON_ERROR
(int)
-
Substitute some unencodable values instead of failing.
-
JSON_PRESERVE_ZERO_FRACTION
(int)
-
Ensures that float values are always encoded as a float value.
-
JSON_UNESCAPED_LINE_TERMINATORS
(int)
-
The line terminators are kept unescaped when
JSON_UNESCAPED_UNICODE is supplied. It uses the same
behaviour as it was before PHP 7.1 without this constant.
Available as of PHP 7.1.0.
The following constants can be combined to form options for
json_decode and json_encode.
-
JSON_INVALID_UTF8_IGNORE
(int)
-
Ignore invalid UTF-8 characters.
Available as of PHP 7.2.0.
-
JSON_INVALID_UTF8_SUBSTITUTE
(int)
-
Convert invalid UTF-8 characters to \0xfffd
(Unicode Character 'REPLACEMENT CHARACTER')
Available as of PHP 7.2.0.
-
JSON_THROW_ON_ERROR
(int)
-
Throws JsonException if an error occurs instead
of setting the global error state that is retrieved with
json_last_error and json_last_error_msg.
JSON_PARTIAL_OUTPUT_ON_ERROR takes precedence over
JSON_THROW_ON_ERROR.
Available as of PHP 7.3.0.
-
JSON_ERROR_NON_BACKED_ENUM
(int)
-
The value passed to json_encode
includes a non-backed enum which cannot be serialized.
Available as of PHP 8.1.0.