(PECL simdjson >= 2.0.0)
simdjson_is_valid — Check if a JSON string is valid
$json = false, int $depth = 512): boolTakes a JSON encoded string and returns true if it is valid.
json
The json string being validated.
This function only works with UTF-8 encoded strings.
This function validates inputs which json_decode() can decode, provided that they are less than 4 GiB long.
depth
Maximum nesting depth of the structure being validated.
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.
Returns true if json is a valid JSON
string, false otherwise.
If json is longer than 4 GiB, a SimdJsonException is thrown as of PECL simdjson 2.1.0,
while previously, a RuntimeException was thrown.
If depth is outside the allowed range,
a SimdJsonValueError is thrown as of PECL simdjson 3.0.0,
while previously, an error of level E_WARNING was raised.
示例 #1 simdjson_decode() examples
<?php
$json = '{"a":1,"b":2,"c":3}';
$invalidJson = '{"a":1,"b":2,"c":';
var_dump(simdjson_is_valid($json));
var_dump(simdjson_is_valid($invalidJson));
?>以上示例会输出：
bool(true) bool(false)
示例 #2 depth errors
<?php
// Encode some data with a maximum depth of 4
// (array -> array -> array -> string)
$json = json_encode(
[
1 => [
'English' => [
'One',
'January'
],
'French' => [
'Une',
'Janvier'
]
]
]
);
// Show the errors for different depths.
var_dump(simdjson_is_valid($json, 4));
var_dump(simdjson_is_valid($json, 3));
?>以上示例会输出：
bool(true) bool(false)
注意:
The JSON spec is not JavaScript, but a subset of JavaScript.
注意:
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.