(PHP 5 >= 5.2.0, PECL json >= 1.2.0)
json_decode — Decodes a JSON string
Takes a JSON encoded string and converts it into a PHP variable.
The json string being decoded.
This function only works with UTF-8 encoded data.
When TRUE, returned objects will be converted into associative arrays.
User specified recursion depth.
Bitmask of JSON decode options. Currently only JSON_BIGINT_AS_STRING is supported (default is to cast large integers as floats)
Это изменение существует только в разрабатываемой версии PHP, и, возможно, будет существовать и после версии 5.3.
Returns the value encoded in json in appropriate PHP type. Values true, false and null (case-insensitive) 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 recursion limit.
Пример #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));
?>
Результат выполнения данного примера:
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)
}
Пример #2 Another example
<?php
$json = '{"foo-bar": 12345}';
$obj = json_decode($json);
print $obj->{'foo-bar'}; // 12345
?>
Пример #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
?>
Пример #4 depth errors
<?php
// Encode the data.
$json = json_encode(
array(
1 => array(
'English' => array(
'One',
'January'
),
'French' => array(
'Une',
'Janvier'
)
)
)
);
// Define the errors.
$json_errors = array(
JSON_ERROR_NONE => 'No error has occurred',
JSON_ERROR_DEPTH => 'The maximum stack depth has been exceeded',
JSON_ERROR_CTRL_CHAR => 'Control character error, possibly incorrectly encoded',
JSON_ERROR_SYNTAX => 'Syntax error',
);
// Show the errors for different depths.
foreach(range(4, 3, -1) as $depth) {
var_dump(json_decode($json, True, $depth));
echo 'Last error : ', $json_errors[json_last_error()], PHP_EOL, PHP_EOL;
}
?>
Результат выполнения данного примера:
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 has occurred
NULL
Last error : The maximum stack depth has been exceeded
Пример #5 json_decode() of large integers
<?php
$json = '12345678901234567890';
var_dump(json_decode($json));
var_dump(json_decode($json, false, 512, JSON_BIGINT_AS_STRING));
?>
Результат выполнения данного примера:
float(1.2345678901235E+19) string(20) "12345678901234567890"
Замечание:
The JSON spec is not JavaScript, but a subset of JavaScript.
Замечание:
In the event of a failure to decode, json_last_error() can be used to determine the exact nature of the error.
| Версия | Описание |
|---|---|
| В будущем | The options parameter was added. |
| 5.3.0 | Added the optional depth. The default recursion depth was increased from 128 to 512 |
| 5.2.3 | The nesting limit was increased from 20 to 128 |