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    PHP JSON Functions

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    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

    PHP Fundamentals course home
    PHP Referrence: The PHP reference contains different categories of all PHP functions, keywords and constants, along with examples.

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