How to convert json into array in php

In PHP, converting JSON to an array is a very common operation. JSON is a lightweight data exchange format that represents data in the form of key-value pairs, and arrays are also a structure for storing data. Converting JSON to an array can help us process and manipulate data more conveniently.

Let’s introduce several methods to convert JSON to array in PHP.

Method 1: json_decode() function

PHP provides a built-in function json_decode() for converting JSON strings into PHP arrays. To use this function, you only need to pass a JSON string as a parameter. This function can also receive an optional parameter $assoc to control the returned array type.

The sample code is as follows:

$json = '{"name":"john", "age":30, "city":"New York"}';

$array = json_decode($json);

print_r($array);

The output result is as follows:

Array
(
   [name] => john
   [age] => 30
   [city] => New York
)

In the above code, $json is a string containing JSON data, which is decoded through the json_decode() function. Convert it to PHP array. Since the $assoc parameter is not passed, an array of object type is returned by default. If you need to return an associative array, you can pass the second parameter as true.

$json = '{"name":"john", "age":30, "city":"New York"}';

$array = json_decode($json, true);

print_r($array);

The output results are as follows:

Array
(
   [name] => john
   [age] => 30
   [city] => New York
)

Method 2: Use the json_decode() function and the file_get_contents() function

In addition to converting the JSON string into an array through the json_decode() function In addition, you can also obtain the JSON file contents through the file_get_contents() function and convert it into a PHP array using the json_decode() function.

The sample code is as follows:

$json = file_get_contents('data.json');

$array = json_decode($json);

print_r($array);

In the above code, use the file_get_contents() function to obtain the contents of the JSON file named data.json, and then use the json_decode() function to convert it into a PHP array .

It should be noted that when using this method, BOM (Byte Order Mark) characters cannot exist in the JSON file, otherwise it will not be correctly parsed and converted into a PHP array.

Method 3: Use json_decode() function and curl library

If you need to obtain the JSON data returned by the remote server and convert it into a PHP array, you can use the curl library and json_decode() function .

The sample code is as follows:

$url = 'http://example.com/data.json';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

$json = curl_exec($ch);

$array = json_decode($json);

curl_close($ch);

print_r($array);

In the above code, use the curl library to send a GET request to obtain the contents of the remote JSON file named data.json, and use the json_decode() function to Convert it to PHP array.

Summary

The above are several methods of converting JSON format data into PHP arrays. If you need to use JSON format data in a PHP project, you can use these methods to convert it into a PHP array for easier processing and manipulation.

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