(PHP 5 >= 5.2.0, PHP 7, PHP 8, PECL json >= 1.2.0)
json_decode — Decodes a JSON string
Takes a JSON encoded string and converts it into a PHP value.
json
The json
string being decoded.
This function only works with UTF-8 encoded strings.
Зауваження:
PHP реалізує повний набір JSON, як визначено в стандарті » RFC 7159.
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 JSON_OBJECT_AS_ARRAY
is set in the flags
.
depth
Maximum nesting depth of the structure being decoded.
The value must be greater than 0
,
and less than or equal to 2147483647
.
flags
Bitmask of
JSON_BIGINT_AS_STRING
,
JSON_INVALID_UTF8_IGNORE
,
JSON_INVALID_UTF8_SUBSTITUTE
,
JSON_OBJECT_AS_ARRAY
,
JSON_THROW_ON_ERROR
.
The behaviour of these constants is described on the
JSON constants page.
Returns the value encoded in json
as an appropriate
PHP type. Unquoted values true
, false
and null
are returned as true
,
false
and null
respectively. null
is returned if the
json
cannot be decoded or if the encoded data is
deeper than the nesting limit.
If depth
is outside the allowed range,
a ValueError is thrown as of PHP 8.0.0,
while previously, an error of level E_WARNING
was raised.
Версія | Опис |
---|---|
7.3.0 |
JSON_THROW_ON_ERROR
flags was added.
|
7.2.0 |
associative is nullable now.
|
7.2.0 |
JSON_INVALID_UTF8_IGNORE , and
JSON_INVALID_UTF8_SUBSTITUTE
flags were added.
|
7.1.0 |
An empty JSON key ("") can be encoded to the empty object property
instead of using a key with value _empty_ .
|
Приклад #1 json_decode() examples
<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>
Поданий вище приклад виведе:
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) }
Приклад #2 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
?>
Приклад #3 common mistakes using json_decode()
<?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
?>
Приклад #4 depth
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;
?>
Поданий вище приклад виведе:
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
Приклад #5 json_decode() of large integers
<?php
$json = '{"number": 12345678901234567890}';
var_dump(json_decode($json));
var_dump(json_decode($json, false, 512, JSON_BIGINT_AS_STRING));
?>
Поданий вище приклад виведе:
object(stdClass)#1 (1) { ["number"]=> float(1.2345678901235E+19) } object(stdClass)#1 (1) { ["number"]=> string(20) "12345678901234567890" }
Зауваження:
The JSON spec is not JavaScript, but a subset of JavaScript.
Зауваження:
In the event of a failure to decode, json_last_error() can be used to determine the exact nature of the error.