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How to convert array to json string array in php

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Release： 2023-04-26 15:09:51

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In PHP development, we often need to convert arrays into JSON strings to complete the data transmission and interaction of the interface. Therefore, it is important to master the method of converting an array into a JSON string in PHP. In this article, we will introduce three common methods and examples to clearly show you how to convert PHP array to JSON string.

1. Use the json_encode function

PHP officially provides a very convenient method: the json_encode() function. This function can convert a PHP array into a JSON string, which is very convenient and easy to use. The following is a sample code for array conversion using the json_encode() function:

$person = array(

'name' => '张三',
'age' => 20,
'gender' => '男'
);
$json = json_encode($ person);
echo $json;
?>
In the above code, we first define the array $person, convert it into a JSON string, and finally print it through the echo statement Out JSON string. 
2. Use json_encode function parameters
When using the json_encode() function, we can pass different parameters to meet our needs. Below we will introduce three common parameter methods using the $person array as an example. 
JSON_FORCE_OBJECT
The JSON_FORCE_OBJECT parameter ensures that the array is converted to a JSON object instead of an array. Here is an example using the JSON_FORCE_OBJECT parameter: 
$person = array(
'name' => '张三',
'age' => 20,
'gender' => '男'
);
$json = json_encode($person, JSON_FORCE_OBJECT); 
echo $json;
?>
In the above code, we pass the JSON_FORCE_OBJECT parameter to the json_encode() function to convert the array $person into a JSON object. 
JSON_PRETTY_PRINT
The JSON_PRETTY_PRINT parameter can make the generated JSON string more beautiful and easier to read. Here is an example using the JSON_PRETTY_PRINT parameter: 
$person = array(
'name' => '张三',
'age' => 20,
'gender' => '男'
);
$json = json_encode($person, JSON_PRETTY_PRINT); 
echo $json;
?>
In the above code, we pass the JSON_PRETTY_PRINT parameter to the json_encode() function to make the generated JSON string more beautiful and easier to read. 
JSON_UNESCAPED_UNICODE
The JSON_UNESCAPED_UNICODE parameter can ignore the escape of Unicode encoding and reduce the length of the generated JSON string. Here is an example using the JSON_UNESCAPED_UNICODE parameter: 
$person = array(
'name' => '张三',
'age' => 20,
'gender' => '男'
);
$json = json_encode($person, JSON_UNESCAPED_UNICODE); 
echo $json;
?>
In the above code, we pass the JSON_UNESCAPED_UNICODE parameter to the json_encode() function, ignoring the escape of Unicode encoding, thereby reducing the generated JSON characters string length. 
3. Manually construct a JSON string
In addition to using the json_encode() function, we can also manually construct a JSON string. Manually constructing JSON strings is also very practical in certain scenarios. Here is a sample code to manually build a JSON string: 
$person = array(
'name' => '张三',
'age' => 20,
'gender' => '男'
);
$json = '{' ;
foreach($person as $key => $value) {
$json .= '"' . $key . '":"' . $value . '",';
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}

$json = substr($json, 0, -1);
$json .= '}';

echo $json;
?>

In the above code, we use a foreach loop to traverse the array $person and manually build a JSON string .

Summary:

This article introduces three methods of converting PHP arrays to JSON strings: using the json_encode() function, using json_encode() function parameters, and manually building a JSON string. No matter which method is used, the purpose of converting the array into a JSON string can be achieved. We can choose different methods to complete array conversion according to specific needs. I hope this article can help readers.

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