There are three ways to create an array of objects in PHP: manually create, construct from a database or API data, and use anonymous classes. First, manually create a small amount of fixed data, such as instantiating multiple objects with a class and storing them into an array; second, after obtaining a two-dimensional array from an external data source such as a database or API, convert each piece of data into an object and add it to the array through a loop; finally, for temporary purposes, anonymous classes can be used to quickly generate an object array, but it is not suitable for complex projects. Selecting the appropriate method according to the actual scene allows you to flexibly realize the creation of object arrays.
Creating an array of objects in PHP is actually quite straightforward, but it may be a bit traversing for beginners. The point is that you have to first understand the basic usage of arrays and objects in PHP, and then you can flexibly combine them.
Create an array of objects manually
The easiest way is to create multiple objects manually and then put them into an array. For example, if you have a User class, you can write it like this:
class User {
public function __construct(
public string $name,
public int $age
) {}
}
$users = [
new User('Alice', 30),
new User('Bob', 25),
new User('Charlie', 35)
]; In this way, $users is an array containing multiple User objects. This writing method is suitable for situations where the data volume is small and the structure is fixed.
Construct an array of objects after getting data from a database or API
More commonly, it is to obtain data from external sources, such as database query results or JSON data returned by the API, and then convert this data into an object array.
For example, suppose you get the following two-dimensional array from the database:
$data = [
['name' => 'Alice', 'age' => 30],
['name' => 'Bob', 'age' => 25],
['name' => 'Charlie', 'age' => 35]
];You can use a loop to generate an array of objects:
$users = [];
foreach ($data as $item) {
$users[] = new User($item['name'], $item['age']);
}This method is very practical when processing dynamic data, especially when querying results with PDO or mysqli.
Quickly create an array of objects using anonymous classes (for temporary purposes)
If you don't need to define a class, just to use the object temporarily, you can use PHP's anonymous class feature:
$people = [
new class('John', 28) {
public function __construct(
public string $name,
public int $age
) {}
},
new class('Jane', 22) {
public function __construct(
public string $name,
public int $age
) {}
}
];Although not recommended for complex projects, it is quite convenient in some scripts or one-time tasks.
Basically these are the ways. The key to creating an object array in PHP is to clarify your data source and usage scenarios, and you can easily solve it by choosing the right method.
The above is the detailed content of how to create a php array of objects. For more information, please follow other related articles on the PHP Chinese website!
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