Home/ Manual/ simdjson / functions/ simdjson_is_valid

simdjson_is_valid

PHP function Edit on GitHub ✎

(PECL simdjson >= 2.0.0)

Check if a JSON string is valid

Description

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

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

Parameters

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.

Return Values

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

Errors/Exceptions

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.

Examples

simdjson_decode() examples

php

<?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));

?>

The above example will output:

output

bool(true)
bool(false)

depth errors

php

<?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));
?>

The above example will output:

output

bool(true)
bool(false)

Notes

Note

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