Php check if string is json string

How to Check If String is a Json in PHP?

Here, I will show you how to works How to check if string is a json in PHP. you can see Validate json in PHP example. we will help you to give example of Check if string is a json or not. you can understand a concept of Json functions and operators in PHP.

json_decode($data, true) will return an object converted into an associative array, and then the is_array() function checks whether the object is an array or not. The json_last_error() returns the last error if there were any errors when json_decode() was invoked.

function json_validator($data) <

if (!empty($data)) <

return is_string($data) &&

is_array(json_decode($data, true)) ? true : false;

>

return false;

>

$data1 = »;

$data2 = »;

echo «Result for data1: «;

echo (json_validator($data1) ? «JSON is Valid\n»

: «JSON is Not Valid\n»);

echo «Result for data2: «;

echo (json_validator($data2) ? «JSON is Valid»

: «JSON is Not Valid»);

?>

Result for data1: JSON is Valid

Result for data2: JSON is Not Valid

function json_validator($data) <

if (!empty($data)) <

@json_decode($data);

return (json_last_error() === JSON_ERROR_NONE);

>

return false;

>

$data1 = »;

$data2 = »;

echo «Result for data1: «;

echo (json_validator($data1) ? «JSON is Valid\n»

: «JSON is Not Valid\n»);

echo «Result for data2: «;

echo (json_validator($data2) ? «JSON is Valid»

: «JSON is Not Valid»);

?>

Result for data1: JSON is Valid

Result for data2: JSON is Not Valid

✌️ Like this article? Follow me on Twitter and Facebook. You can also subscribe to RSS Feed.

You might also like.

Источник

PHP RFC: is_json

This RFC introduces a new function called is_json() to validate if an string contains a valid json.

Most userland implementations to achieve this are done using json_decode() which by design generates an object/array while parsing the string, ergo using memory and processing, that could be save.

Proposal

Description

is_json(string $json, int $depth = 512, int $flags = 0): bool

Parameters

The json string being analyzed.

This function only works with UTF-8 encoded strings.

PHP implements a superset of JSON as specified in the original » RFC 7159.

Maximum nesting depth of the structure being decoded.

Bitmask of JSON_INVALID_UTF8_IGNORE, JSON_THROW_ON_ERROR. The behavior of these constants is described on the JSON constants page.

Function description, examples, technical strategy, current JSON parser, etc.

Return values

Returns true if the string passed contains a valid json, otherwise returns false.

Extra behavior

Examples

Fundaments/Reasons

Disadvantages of using json_decode

By design, json_decode() generates an object/array while parsing the string, ergo using memory and processing for it, that is not needed if the only thing to discover is if a string contains a valid json.

Disadvantages of using regex

Using a regex for this task forces different, error-prone, hard to maintain, implementations.

Needs from major projects and developers

In the “References” section, there is a list of major open-source php projects needing this feature; also in th mntioned section can find a link to one of the most popular StackOverflow questions, which somehow reflects the need from our developers to have a feature like this included.

Complexity added in the core

At the moment, there is a JSON parser in the core, used by json_decode to do its job, so there is no need to write a new JSON parser for this RFC ; the proposed function will use the existing JSON parser exclusively to parse an string without generating any object/array in memory for it.

Backward Incompatible Changes

None, as this is a new function only.

is_json will no longer be available as a function name, could break potential userland implementations.

Proposed PHP Version(s)

RFC Impact

This RFC has no impact on SAPIs, existing extensions, Opcache, etc.

Источник

Check if String is a Valid Json in PHP

This tutorial will discuss about unique ways to check if string is a valid json in php.

Table Of Contents

Method 1: Using json_decode()

The json_decode() accepts a JSON encoded string as parameter, and if it is a valid json string then it converts the string into a PHP value. Where if it is not a valid JSON then the last error will not be JSON_ERROR_NONE.

We have create a function to validate JSON string i.e.

It accepts a string as argument and returns true if given string is a valid JSON string.

Frequently Asked:

Let’s see the complete example,

 $strValue = '< "name": "Ritika", "age" : 32, "city": "London" >'; if (isStringJson($strValue)) < echo "The string represents valid JSON."; >else < echo "The string does not represent valid JSON."; >?>

The string represents valid JSON.

Method 2: Using json_decode() with error suppression

If error suppression is enabled, then we can rely on the return valud of json_decode() .

The json_decode() accepts a JSON encoded string as parameter, and if it is a valid json string then it converts the string into a PHP value. If it is not a valid JSON string then it returns null.

We have create a function to validate JSON string i.e.

It accepts a string as argument and returns true if given string is a valid JSON string.

Let’s see the complete example,

 $strValue = ''; if (isValidJSON($strValue)) < echo "The string represents valid JSON."; >else < echo "The string does not represent valid JSON."; >?>

The string represents valid JSON.

Summary

We learned about two ways to check if a string is a valid JSON string or not in PHP.

Related posts:

Share your love

Leave a Comment Cancel Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Terms of Use

Disclaimer

Copyright © 2023 thisPointer

To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.

Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.

The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.

The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.

The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.

The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.

Источник