# simdjson_is_valid

(PECL simdjson >= 2.0.0)

simdjson_is_valid — Check if a JSON string is valid

### Descripción

simdjson_is_valid(string `$json` = `false`, int `$depth` = 512): bool

Takes a JSON encoded string and returns true if it is valid.

### Parámetros

`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.

### Valores devueltos

Returns `true` if `json` is a valid JSON string, `false` otherwise.

### Errores/Excepciones

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.

### Ejemplos

Ejemplo #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));
?>`

El resultado del ejemplo sería:

    bool(true)
    bool(false)

Ejemplo #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));
?>`

El resultado del ejemplo sería:

    bool(true)
    bool(false)

### Notas

> Nota:

> The JSON spec is not JavaScript, but a subset of JavaScript.

> Nota:

> 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.

### Ver también

- json_encode() - Retorna la representación JSON del valor dado
- json_decode() - Decodifica un string de JSON