json_decode
Decodes a JSON string
&reftitle.description;
mixedjson_decode
stringjson
boolassocfalse
intdepth512
intoptions0
Takes a JSON encoded string and converts it into a PHP variable.
&reftitle.parameters;
json
The json string being decoded.
This function only works with UTF-8 encoded strings.
&json.implementation.superset;
assoc
When &true;, returned objects will be converted into
associative arrays.
depth
User specified recursion depth.
options
Bitmask of JSON decode options. Currently there are two supported
options. The first is JSON_BIGINT_AS_STRING that
allows casting big integers to string instead of floats which is the
defaul. The second option is JSON_OBJECT_AS_ARRAY
that has the same effect as setting assoc to
&true;.
&reftitle.returnvalues;
Returns the value encoded in json in appropriate
PHP type. 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 recursion limit.
&reftitle.examples;
<function>json_decode</function> examples
]]>
&example.outputs;
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)
}
]]>
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.
{'foo-bar'}; // 12345
?>
]]>
common mistakes using <function>json_decode</function>
]]>
<parameter>depth</parameter> errors
array(
'English' => array(
'One',
'January'
),
'French' => array(
'Une',
'Janvier'
)
)
)
);
// Define the errors.
$constants = get_defined_constants(true);
$json_errors = array();
foreach ($constants["json"] as $name => $value) {
if (!strncmp($name, "JSON_ERROR_", 11)) {
$json_errors[$value] = $name;
}
}
// 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;
}
?>
]]>
&example.outputs;
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: JSON_ERROR_NONE
NULL
Last error: JSON_ERROR_DEPTH
]]>
<function>json_decode</function> of large integers
]]>
&example.outputs;
float(1.2345678901235E+19)
}
object(stdClass)#1 (1) {
["number"]=>
string(20) "12345678901234567890"
}
]]>
&reftitle.notes;
The JSON spec is not JavaScript, but a subset of JavaScript.
In the event of a failure to decode, json_last_error
can be used to determine the exact nature of the error.
&reftitle.changelog;
&Version;
&Description;
5.6.0
Invalid non-lowercased variants of the true,
false and null literals are no
longer accepted as valid input, and will generate warnings.
5.4.0
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
5.2.1
Added support for JSON decoding of basic types.
&reftitle.seealso;
json_encode
json_last_error