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This article shows you what the common methods of php json are, which are concise and easy to understand, which can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Php json commonly used methods: 1, json_encode (), used to decode the string in JSON format; 2, json_encode (), used to decode the string in JSON format; 3, json_last_error (), used to return the last error.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Common methods of php json:

1. Json_encode ()

PHP json_encode () is used to JSON the variable, and the function returns JSON data if the execution succeeds, otherwise it returns FALSE.

Grammar

String json_encode ($value [, $options = 0])

Example:

Output result:

{"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}

2. Json_encode ()

The json_decode () function is used to decode a string in JSON format and convert it to a PHP variable.

Syntax:

Mixed json_decode ($json_string [, $assoc = false [, $depth = 512 [, $options = 0])

Parameters:

Json_string: the JSON string to be decoded, which must be UTF-8 encoded data

Assoc: an array is returned when this parameter is TRUE, and an object is returned when FALSE.

Depth: an integer type parameter that specifies the recursion depth

Options: binary mask, currently only supports JSON_BIGINT_AS_STRING.

Example:

Output result:

Object (stdClass) # 1 (5) {["a"] = > int (1) ["b"] = > int (2) ["c"] = > int (3) ["d"] = > int (4) ["e"] = > int (5)} array (5) {["a"] = > int (1) ["b"] = > int (2) ["c"] = > int (3) ["d" ] = > int (4) ["e"] = > int (5)}

3. Json_last_error ()

Json_last_error-returns the last error that occurred

Syntax:

Json_last_error ()

If so, returns the last error that occurred during JSON encoding and decoding. An integer (integer) is returned, which will be one of the following constants:

JSON error code constant meaning usability JSON_ERROR_NONE no error occurred

JSON_ERROR_DEPTH has reached the maximum stack depth

Invalid or abnormal JSON_ERROR_STATE_MISMATCH JSON

JSON_ERROR_CTRL_CHAR control character error, may be incorrect encoding

JSON_ERROR_SYNTAX syntax error

The abnormal UTF-8 character of JSON_ERROR_UTF8 may be due to incorrect encoding. The type specified by PHP 5.3.3JSON_ERROR_RECURSIONOne or more recursive references in the value to be encodedPHP 5.5.0JSON_ERROR_INF_OR_NANOne or more NAN or INF values in the value to be encodedPHP 5.5.0JSON_ERROR_UNSUPPORTED_TYPE, the value cannot be encoded. The property name specified by PHP 5.5.0JSON_ERROR_INVALID_PROPERTY_NAME cannot be encoded. PHP 7.0.0JSON_ERROR_UTF16 malformed UTF-16 characters, probably because of incorrect character encoding. PHP 7.0.0

Example:

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