How to convert json string array to object array in php

In PHP, we often need to convert JSON string arrays into object arrays so that we can process and use the data. In order to accomplish this task, we can use the json_decode() function provided in PHP to parse the JSON string and then convert it into an object array.

The following is an example to convert a JSON string array into an object array.

$json = '[
    {"name": "Alice", "age": 25},
    {"name": "Bob", "age": 30},
    {"name": "Charlie", "age": 35}
]';

$people = json_decode($json);

foreach ($people as $person) {
    echo $person->name . ' is ' . $person->age . ' years old.' . PHP_EOL;
}

In this example, we first define a JSON string array. Then, we called the json_decode() function to convert it to a PHP object. Finally, we use a foreach loop to iterate through the array of objects and output the name and age of each person.

It should be noted that the json_decode() function parses the JSON string into a PHP object, which can be an anonymous object of type stdClass or an object of a specific class. For this example, since we did not specify what type of object the JSON string will be parsed into, it will be parsed into an object of type stdClass by default.

If we want to parse the JSON string into an object of a specific class, we can do it by passing the second parameter to the json_decode() function. For example, we can define a Person class to represent each person's information, and then parse the JSON string into an array of Person objects, as shown below:

class Person {
    public $name;
    public $age;
    
    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }
}

$json = '[
    {"name": "Alice", "age": 25},
    {"name": "Bob", "age": 30},
    {"name": "Charlie", "age": 35}
]';

$people = json_decode($json, false);

$personObjects = array();
foreach($people as $person) {
    $personObjects[] = new Person($person->name, $person->age);
}

foreach ($personObjects as $person) {
    echo $person->name . ' is ' . $person->age . ' years old.' . PHP_EOL;
}

In this example, we first define a class named Person A class that contains name and age properties and a constructor. Next, we parse the JSON string into an array of objects and convert them into an array of Person objects. Finally, we use a foreach loop to output the name and age of each person.

In short, converting a JSON string array into an object array is one of the common operations in PHP. We can use the json_decode() function to accomplish this task, and we can specify which type of object to parse by passing the second parameter. After completing this task, we can use it to process data, operate and use it.

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