json_decode

Decodes a JSON string

mixed **json_decode** string $json  $associative int $depth int $flags

Takes a JSON encoded string and converts it into a PHP value.

json The being decoded. json``string

This function only works with UTF-8 encoded strings.

associative When true, JSON objects will be returned as associative arrays; when false, JSON objects will be returned as objects. When null, JSON objects will be returned as associative arrays or objects depending on whether is set in the . JSON_OBJECT_AS_ARRAY``flags

depth Maximum nesting depth of the structure being decoded. The value must be greater than , and less than or equal to . 0``2147483647

flags Bitmask of , , , , . The behaviour of these constants is described on the page. JSON_BIGINT_AS_STRING``JSON_INVALID_UTF8_IGNORE``JSON_INVALID_UTF8_SUBSTITUTE``JSON_OBJECT_AS_ARRAY``JSON_THROW_ON_ERRORJSON constants

Returns the value encoded in as an appropriate PHP type. Unquoted values , and are returned as true, false and null respectively. null is returned if the cannot be decoded or if the encoded data is deeper than the nesting limit. json``true``false``null``json

If is outside the allowed range, a is thrown as of PHP 8.0.0, while previously, an error of level was raised. depth``ValueError``E_WARNING

Voorbeeld: examples

<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

var_dump(json_decode($json));
var_dump(json_decode($json, true));

?>

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)
}

Voorbeeld: Accessing invalid object properties

Accessing elements within an object that contain characters not permitted under PHP's naming convention (e.g. the hyphen) can be accomplished by encapsulating the element name within braces and the apostrophe.

<?php

$json = '{"foo-bar": 12345}';

$obj = json_decode($json);
print $obj->{'foo-bar'}; // 12345

?>

**Voorbeeld: common mistakes using **

<?php

// the following strings are valid JavaScript but not valid JSON

// the name and value must be enclosed in double quotes
// single quotes are not valid 
$bad_json = "{ 'bar': 'baz' }";
json_decode($bad_json); // null

// the name must be enclosed in double quotes
$bad_json = '{ bar: "baz" }';
json_decode($bad_json); // null

// trailing commas are not allowed
$bad_json = '{ bar: "baz", }';
json_decode($bad_json); // null

?>

Voorbeeld: errors

<?php
// Encode some data with a maximum depth  of 4 (array -> array -> array -> string)
$json = json_encode(
    array(
        1 => array(
            'English' => array(
                'One',
                'January'
            ),
            'French' => array(
                'Une',
                'Janvier'
            )
        )
    )
);

// Show the errors for different depths.
var_dump(json_decode($json, true, 4));
echo 'Last error: ', json_last_error_msg(), PHP_EOL, PHP_EOL;

var_dump(json_decode($json, true, 3));
echo 'Last error: ', json_last_error_msg(), PHP_EOL, PHP_EOL;
?>

array(1) {
  [1]=>
  array(2) {
    ["English"]=>
    array(2) {
      [0]=>
      string(3) "One"
      [1]=>
      string(7) "January"
    }
    ["French"]=>
    array(2) {
      [0]=>
      string(3) "Une"
      [1]=>
      string(7) "Janvier"
    }
  }
}
Last error: No error

NULL
Last error: Maximum stack depth exceeded

Voorbeeld: of large integers

<?php
$json = '{"number": 12345678901234567890}';

var_dump(json_decode($json));
var_dump(json_decode($json, false, 512, JSON_BIGINT_AS_STRING));

?>

object(stdClass)#1 (1) {
  ["number"]=>
  float(1.2345678901235E+19)
}
object(stdClass)#1 (1) {
  ["number"]=>
  string(20) "12345678901234567890"
}

Opmerking: > The JSON spec is not JavaScript, but a subset of JavaScript.

Opmerking: > In the event of a failure to decode, can be used to determine the exact nature of the error. json_last_error

json_encode``json_last_error``json_last_error_msg

Volgende json_encode →

json_decode

json_decode

Documentatie