Home Backend Development PHP Problem How to convert json data to array in php

How to convert json data to array in php

Apr 24, 2023 pm 02:51 PM

In Web development, JSON technology has become an indispensable part and is widely used in front-end and back-end data transmission and storage. In PHP language, we often need to convert JSON data into arrays for operation and processing. This article will introduce you to how to convert JSON into an array.

1. Use the json_decode() function

In PHP, we can use the built-in function json_decode() to parse a JSON string into a PHP array. The basic usage of this function is as follows:

mixed json_decode ( string $json [, bool $assoc = false [, int $depth = 512 [, int $options = 0 ]]] )
Copy after login

Among them, the parameter $json represents the JSON string to be parsed, $assoc represents whether to convert the parsed object into an array with key names, the default is false, $depth Represents the depth of parsing, the default is 512, $options represents parsing options, the default is 0.

For example, we have the following JSON string:

{"name": "Tom", "age": 18, "hobbies": ["music", "movies"]}
Copy after login

We can convert it into an array through the following PHP code:

$json = '{"name": "Tom", "age": 18, "hobbies": ["music", "movies"]}';
$arr = json_decode($json, true);
print_r($arr);
Copy after login

The output result is as follows:

Array
(
    [name] => Tom
    [age] => 18
    [hobbies] => Array
        (
            [0] => music
            [1] => movies
        )

)
Copy after login

2. Dealing with common problems in conversion

In actual applications, we may encounter the problem that some JSON strings cannot be correctly converted into arrays. Next, we will introduce some common problems and its solution.

  1. The JSON string contains special characters

For example, when the JSON string contains special characters such as single quotes or double quotes, the program will report an error or the conversion will fail. Case. At this time, we can avoid this situation by escaping the string. PHP provides a built-in function addslashes() for escaping.

For example:

$json = '{"name": "Tom\'s book", "page": "100\""}';
$json = addslashes($json);
$arr = json_decode($json, true);
print_r($arr);
Copy after login

The output result is as follows:

Array
(
    [name] => Tom's book
    [page] => 100"
)
Copy after login
  1. The JSON string contains Chinese

When the JSON string contains In Chinese, if no processing is done, it will cause conversion failure or garbled characters. PHP provides a built-in function json_encode() to convert an array into a JSON string, and parameters can be set to avoid Chinese garbled characters.

For example:

$arr = array('name' => '张三', 'age' => 19);
$json = json_encode($arr, JSON_UNESCAPED_UNICODE);
echo $json;
Copy after login

The program will output the following results:

{"name":"张三","age":19}
Copy after login

When performing reverse processing, you need to use a JSON string in UTF-8 encoding format, otherwise the same There will be garbled code problems.

  1. JSON string format error

When the JSON string format is incorrect, the json_decode() function will not be able to parse the string correctly. At this time, we need to first perform format verification on the JSON string, and then correct it according to different error types.

For example:

$json = '[{"name": "Tom", "age": 18}, {"name": "Bob", "age":19}';
$arr = json_decode($json, true);
if (json_last_error() !== JSON_ERROR_NONE) {
    switch (json_last_error()) {
        case JSON_ERROR_DEPTH:
            echo 'JSON字符串超出最大剖析深度';
            break;
        case JSON_ERROR_STATE_MISMATCH:
            echo 'JSON字符串格式错误';
            break;
        case JSON_ERROR_UTF8:
            echo 'JSON字符串包含非UTF-8字符';
            break;
        default:
            echo 'JSON字符串解析失败';
            break;
    }
} else {
    print_r($arr);
}
Copy after login

The output result is as follows:

JSON字符串格式错误
Copy after login

The above is the method to convert JSON into an array and the solutions to various problems. I hope this article can be helpful to PHP developers.

The above is the detailed content of How to convert json data to array in php. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8 JIT (Just-In-Time) Compilation: How it improves performance. PHP 8 JIT (Just-In-Time) Compilation: How it improves performance. Mar 25, 2025 am 10:37 AM

PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.

OWASP Top 10 PHP: Describe and mitigate common vulnerabilities. OWASP Top 10 PHP: Describe and mitigate common vulnerabilities. Mar 26, 2025 pm 04:13 PM

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

PHP Secure File Uploads: Preventing file-related vulnerabilities. PHP Secure File Uploads: Preventing file-related vulnerabilities. Mar 26, 2025 pm 04:18 PM

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

PHP Encryption: Symmetric vs. asymmetric encryption. PHP Encryption: Symmetric vs. asymmetric encryption. Mar 25, 2025 pm 03:12 PM

The article discusses symmetric and asymmetric encryption in PHP, comparing their suitability, performance, and security differences. Symmetric encryption is faster and suited for bulk data, while asymmetric is used for secure key exchange.

How do you retrieve data from a database using PHP? How do you retrieve data from a database using PHP? Mar 20, 2025 pm 04:57 PM

Article discusses retrieving data from databases using PHP, covering steps, security measures, optimization techniques, and common errors with solutions.Character count: 159

PHP Authentication & Authorization: Secure implementation. PHP Authentication & Authorization: Secure implementation. Mar 25, 2025 pm 03:06 PM

The article discusses implementing robust authentication and authorization in PHP to prevent unauthorized access, detailing best practices and recommending security-enhancing tools.

What is the purpose of prepared statements in PHP? What is the purpose of prepared statements in PHP? Mar 20, 2025 pm 04:47 PM

Prepared statements in PHP enhance database security and efficiency by preventing SQL injection and improving query performance through compilation and reuse.Character count: 159

What is the purpose of mysqli_query() and mysqli_fetch_assoc()? What is the purpose of mysqli_query() and mysqli_fetch_assoc()? Mar 20, 2025 pm 04:55 PM

The article discusses the mysqli_query() and mysqli_fetch_assoc() functions in PHP for MySQL database interactions. It explains their roles, differences, and provides a practical example of their use. The main argument focuses on the benefits of usin

See all articles