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PHP JSON Functions


PHP JSON Introduction

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

In PHP 5, the decoding is handled by a parser based on the JSON_checker by Douglas Crockford.

PHP 7 has a new and improved parser specifically written for PHP and licensed under the PHP license.


Installation

From PHP 5.2.0, the JSON functions are enabled by default. There is no installation needed to use these functions.


PHP JSON 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

PHP Predefined JSON Constants

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. PHP 5.3
JSON_ERROR_RECURSION Integer Invalid recursive reference values. PHP 5.5
JSON_ERROR_INF_OR_NAN Integer Invalid NAN or INF values. PHP 5.5
JSON_ERROR_UNSUPPORTED_TYPE Integer Invalid type. PHP 5.5
JSON_ERROR_INVALID_PROPERTY_NAME Integer Invalid property name. PHP 7.0
JSON_ERROR_UTF16 Integer Malformed UTF-16 characters. PHP 7.0
JSON_BIGINT_AS_STRING Integer  
JSON_OBJECT_AS_ARRAY Integer  
JSON_HEX_TAG Integer  
JSON_HEX_AMP Integer  
JSON_HEX_APOS Integer  
JSON_HEX_QUOT Integer  
JSON_FORCE_OBJECT Integer  
JSON_NUMERIC_CHECK Integer  
JSON_PRETTY_PRINT Integer  
JSON_UNESCAPED_SLASHES Integer  
JSON_PARTIAL_OUTPUT_ON_ERROR Integer  
JSON_PRESERVE_ZERO_FRACTION Integer  
JSON_UNESCAPED_LINE_TERMINATORS Integer  
JSON_INVALID_UTF8_IGNORE Integer  
JSON_INVALID_UTF8_SUBSTITUTE Integer  
JSON_THROWN_ON_ERROR Integer