PHP JSON

In this chapter we will introduce how to use PHP language to encode and decode JSON objects.

Environment configuration

JSON extension has been built-in in php5.2.0 and above.

JSON function

Function

Description

json_encode JSON encoding of variables

json_decode Decodes JSON format strings and converts them into PHP variables

json_last_error Returns the last error that occurred

json_encode

PHP json_encode() is used to encode variables JSON encoding, this function returns JSON data if executed successfully, otherwise it returns FALSE.

Syntax

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

Parameters

value: The value to be encoded. This function is only valid for UTF-8 encoded data.

options: Binary mask consisting of the following constants: JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT

Examples

The following examples demonstrate how Convert a PHP array to JSON format data:

<?php
   $arr = array(&#39;a&#39; => 1, &#39;b&#39; => 2, &#39;c&#39; => 3, &#39;d&#39; => 4, &#39;e&#39; => 5);
   echo json_encode($arr);
?>

The execution result of the above code is:

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

The following example demonstrates how to convert a PHP object to JSON format data:

<?php
   class Emp {
       public $name = "";
       public $hobbies  = "";
       public $birthdate = "";
   }
   $e = new Emp();
   $e->name = "sachin";
   $e->hobbies  = "sports";
   $e->birthdate = date(&#39;m/d/Y h:i:s a&#39;, "8/5/1974 12:20:03 p");
   $e->birthdate = date(&#39;m/d/Y h:i:s a&#39;, strtotime("8/5/1974 12:20:03"));

   echo json_encode($e);
?>

The execution result of the above code is:

{"name":"sachin","hobbies":"sports","birthdate":"08\/05\/1974 12:20:03 pm"}

json_decode

PHP The json_decode() function is used to decode strings in JSON format and convert them into PHP variables.

Syntax

mixed json_decode ($json [,$assoc = false [, $depth = 512 [, $options = 0 ]]])

Parameters

json_string: JSON string to be decoded, must be UTF-8 encoded data

assoc: When this parameter is TRUE When , an array is returned, when FALSE an object is returned.

depth: Integer type parameter, which specifies the recursion depth

options: Binary mask, currently only JSON_BIGINT_AS_STRING is supported.

Example

The following example demonstrates how to decode JSON data:

The execution result of the above code is:

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)
}

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