Convert php array to json object array

PHP is a widely used web programming language popular for its ease of use and flexible manipulation. In PHP, array is an important data type and is widely used in web development and data processing. In practice, we usually need to convert the array into an array of JSON objects to facilitate data transfer between the browser side and the server side. This article will introduce methods and techniques for converting PHP arrays into JSON object arrays.

What is a JSON object array?

JSON (JavaScript Object Notation) is a lightweight data exchange format developed from JavaScript. It stores data in the form of key-value pairs, which can be easily parsed and generated by web browsers and servers. A JSON object array is an array composed of multiple JSON objects, usually used to transmit data, store data, or serve as a data source.

Method of converting PHP array to JSON object array

PHP comes with json_encode() function, which can convert a PHP array into a string in JSON format. However, to convert a PHP array to a JSON object array, some parameter configurations are required for the json_encode() function.

<code class="php">// 创建一个PHP数组
$arr = array(
    array('name' => 'Tom', 'age' => 20),
    array('name' => 'Jack', 'age' => 21),
    array('name' => 'Lucy', 'age' => 22)
);
// 将PHP数组转换为JSON对象数组
$json_arr = json_decode(json_encode($arr), true);
// 输出JSON对象数组
var_dump($json_arr);</code>

In the above code, $arr is an index array composed of multiple associative arrays. Use the json_encode() function to convert it to a JSON format string, then use the json_decode() function to convert it to a JSON object array, and assign it to the $json_arr variable. Finally, use the var_dump() function to output its contents.

After running the above code, we can see that the content of the $output_arr variable is as follows:

<code>array(3) {
  [0]=>
  array(2) {
    ["name"]=>
    string(3) "Tom"
    ["age"]=>
    int(20)
  }
  [1]=>
  array(2) {
    ["name"]=>
    string(4) "Jack"
    ["age"]=>
    int(21)
  }
  [2]=>
  array(2) {
    ["name"]=>
    string(4) "Lucy"
    ["age"]=>
    int(22)
  }
}</code>

The above code converts the PHP array according to the rules of JSON format and generates a JSON object array. Each element is a JSON object that can be accessed by index or key name.

Parameter configuration of json_encode() function

The json_encode() function is one of the most important functions for converting PHP variables to JSON format. Its complete syntax is as follows:

<code>string json_encode ( mixed $value [, int $options = 0 [, int $depth = 512 ]] )</code>

Among them, the $value parameter is a PHP variable to be encoded into JSON format; the $options parameter is some optional parameters. Commonly used options are:

• JSON_HEX_QUOT: Replace " with \u0022.
• JSON_PRETTY_PRINT: Make the JSON string more readable, adding newlines and indentation before each level of data
• JSON_UNESCAPED_UNICODE: Will not encode Unicode characters into \uXXXX format ##.
#JSON_FORCE_OBJECT: Always convert a numeric index array to a JSON object

When converting a PHP array to a JSON object array, you usually need to use the JSON_FORCE_OBJECT option to ensure that the resulting JSON string is always It is a JSON object. For example:

<code class="PHP">    $json_arr = json_decode(json_encode($arr, JSON_FORCE_OBJECT), true);</code>

In addition, in order to reduce the size of the JSON string, do not include too many meaningless characters such as spaces, newlines, and tabs in the data

.

Summary

PHP array is an important data structure in web development. After being converted into a JSON object array, data can be easily transmitted and stored. In practice, the json_encode() function can be used to convert the PHP array. Convert to a JSON format string, and then use the json_decode() function to convert it into a JSON object array. When using the json_encode() function, you need to pay attention to the configuration of the options to ensure that the generated JSON string meets expectations and does not contain too many meaningless characters to improve data transmission efficiency

.

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