SunshinePHP Developer Conference 2015

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_STATE_MISMATCH (integer)
Occurs with underflow or with the modes mismatch.
JSON_ERROR_CTRL_CHAR (integer)
Control character error, possibly incorrectly encoded.
JSON_ERROR_SYNTAX (integer)
Syntax error.
JSON_ERROR_UTF8 (integer)
Malformed UTF-8 characters, possibly incorrectly encoded. This constant is available as of PHP 5.3.1.

The following constants can be combined to form options for json_encode(). They are all available as of PHP 5.3.0.

JSON_HEX_TAG (integer)
All < and > are converted to \u003C and \u003E.
JSON_HEX_AMP (integer)
All &s are converted to \u0026.
JSON_HEX_APOS (integer)
All ' are converted to \u0027.
JSON_HEX_QUOT (integer)
All " are converted to \u0022.
JSON_FORCE_OBJECT (integer)
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 (integer)
Encodes numeric strings as numbers. Available since PHP 5.3.3.
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User Contributed Notes 1 note

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Yzmir Ramirez
27 days ago
If you curious of the numeric values of the constants, as of JSON 1.2.1, the constants have the following values (not that you should use the numbers directly):

JSON_HEX_TAG => 1
JSON_HEX_AMP => 2
JSON_HEX_APOS => 4
JSON_HEX_QUOT => 8
JSON_FORCE_OBJECT => 16
JSON_NUMERIC_CHECK => 32
JSON_UNESCAPED_SLASHES => 64
JSON_PRETTY_PRINT => 128
JSON_UNESCAPED_UNICODE => 256

JSON_ERROR_DEPTH => 1
JSON_ERROR_STATE_MISMATCH => 2
JSON_ERROR_CTRL_CHAR => 3

JSON_ERROR_SYNTAX => 4

JSON_ERROR_UTF8 => 5
JSON_OBJECT_AS_ARRAY => 1

JSON_BIGINT_AS_STRING => 2
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