PHPJSON Functions

PHP JSON Introduction

The JSON extension implements the JavaScript Object Notation data-interchange format.

From PHP 5.2, the JSON functions are enabled by default. There is no installation needed to use these functions.

Function	Description
json_decode()	Decodes a JSON string
json_encode()	Encode a value to JSON format
json_last_error()	Returns the last error occurred
json_last_error_msg()	Returns the error string of the last json_encode() or json_decode() call
json_validate()	Checks if a string contains valid JSON (PHP 8.3)

Constant	Type	Description
JSON_ERROR_NONE	Integer	No error has occurred
JSON_ERROR_DEPTH	Integer	Maximum stack depth has been exceeded
JSON_ERROR_STATE_MISMATCH	Integer	Invalid/Malformed JSON
JSON_ERROR_CTRL_CHAR	Integer	Control character error
JSON_ERROR_SYNTAX	Integer	Syntax error
JSON_ERROR_UTF8	Integer	Malformed UTF-8 characters
JSON_ERROR_RECURSION	Integer	Invalid recursive reference values
JSON_ERROR_INF_OR_NAN	Integer	Invalid NAN or INF values
JSON_ERROR_UNSUPPORTED_TYPE	Integer	Invalid type
JSON_ERROR_INVALID_PROPERTY_NAME	Integer	Invalid property name
JSON_ERROR_UTF16	Integer	Malformed UTF-16 characters
JSON_BIGINT_AS_STRING	Integer
JSON_OBJECT_AS_ARRAY	Integer
JSON_HEX_TAG	Integer	All < and > are converted to \u003C and \u003E
JSON_HEX_AMP	Integer	All & 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
JSON_NUMERIC_CHECK	Integer	Encodes numeric strings as numbers
JSON_PRETTY_PRINT	Integer	Use whitespace in returned data to format it
JSON_UNESCAPED_SLASHES	Integer	Do not escape /
JSON_PARTIAL_OUTPUT_ON_ERROR	Integer
JSON_PRESERVE_ZERO_FRACTION	Integer
JSON_UNESCAPED_LINE_TERMINATORS	Integer
JSON_INVALID_UTF8_IGNORE	Integer	Ignore invalid UTF-8 characters
JSON_INVALID_UTF8_SUBSTITUTE	Integer	Convert invalid UTF-8 characters to \0xfffd
JSON_THROWN_ON_ERROR	Integer