simdjson_decode
(PECL simdjson >= 2.0.0)
simdjson_decode — Decodes a JSON string
Description
Takes a JSON encoded string and converts it into a PHP value.
This uses a faster Simultaneous Instruction, Multiple Data implementation
than json_decode() when it is supported by the computer architecture.
Parameters
json-
The json string being decoded.
This function only works with UTF-8 encoded strings.
This function parses valid inputs which
json_decode() can decode,
provided that they are less than 4 GiB long.
associative-
When true, JSON objects will be returned as
associative arrays; when false, JSON objects will be returned as objects.
depth-
Maximum nesting depth of the structure being decoded.
The value must be greater than 0,
and less than or equal to 2147483647.
Callers should use reasonably small values,
because larger depths require more buffer space and will
increase the recursion depth, unlike the current json_decode() implementation.
Return Values
Returns the value encoded in json in appropriate
PHP type. Values true, false and
null are returned as true, false and null
respectively.
Examples
Example #1 simdjson_decode() examples
<?php
$json = '{"a":1,"b":2,"c":3}';
var_dump(simdjson_decode($json));
var_dump(simdjson_decode($json, true));
?>
The above example will output:
object(stdClass)#1 (3) {
["a"]=>
int(1)
["b"]=>
int(2)
["c"]=>
int(3)
}
array(3) {
["a"]=>
int(1)
["b"]=>
int(2)
["c"]=>
int(3)
}
Example #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}';
$obj = simdjson_decode($json);
print $obj->{'foo-bar'}; // 12345
?>
Example #3 common mistakes using simdjson_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
$bad_json = "{ 'bar': 'baz' }";
simdjson_decode($bad_json); // Throws SimdJsonException
// the name must be enclosed in double quotes
$bad_json = '{ bar: "baz" }';
simdjson_decode($bad_json); // Throws SimdJsonException
// trailing commas are not allowed
$bad_json = '{ bar: "baz", }';
simdjson_decode($bad_json); // Throws SimdJsonException
?>
Example #4 depth errors
<?php
// Encode some data with a maximum depth of 4
// (array -> array -> array -> string)
$json = json_encode(
[
1 => [
'English' => [
'One',
'January'
],
'French' => [
'Une',
'Janvier'
]
]
]
);
// Show the errors for different depths.
var_dump(simdjson_decode($json, true, 4));
try {
var_dump(simdjson_decode($json, true, 3));
} catch (SimdJsonException $e) {
echo "Caught: ", $e->getMessage(), "\n";
}
?>
The above example will output:
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"
}
}
}
Caught: The JSON document was too deep (too many nested objects and arrays)
Example #5 simdjson_decode() of large integers
<?php
$json = '{"number": 12345678901234567890}';
var_dump(simdjson_decode($json));
?>
The above example will output:
object(stdClass)#1 (1) {
["number"]=>
float(1.2345678901235E+19)
}
Notes
Note:
The JSON spec is not JavaScript, but a subset of JavaScript.
Note:
In the event of a failure to decode,
a SimdJsonException is thrown
and SimdJsonException::getCode() and
SimdJsonException::getMessage() can be used
to determine the exact nature of the error.
Simdjson Functions
Simdjson Functions