How to get objects in php array

In PHP, array is one of the key data types, which is used to store a series of values. Usually, the values ​​in an array are scalar types, such as strings, integers, and floating point numbers. However, sometimes you may encounter a situation where you need to store objects in an array. Next, let's talk about how to get objects in PHP arrays.

First of all, we need to know that in PHP, an object is a special data type that can encapsulate data and operations on the data, so that the data can be used through a simple interface. After an object is instantiated, it can be passed and stored as a special value.

In PHP, we can use the keyword "new" to generate an object. For example:

class Foo {
    public $value = 'hello';
}

$foo = new Foo();

In the above code, we define a class named Foo and create a new instantiation object $foo. This object has a public property named $value.

Next, let’s take a look at how to store objects in an array:

$foo1 = new Foo();
$foo2 = new Foo();

$arr = array($foo1, $foo2);

In the above code, we define two instantiated objects $foo1 and $foo2, and then store them in the $arr array.

So, how do we remove these objects from the array? It's very simple, just use the array subscript to access each element:

echo $arr[0]->value; // 输出“hello”
echo $arr[1]->value; // 输出“hello”

In the above code, we access the first and second elements in the array, and then output their common attributes $ The value of value.

In addition to using array subscripts to access each element, we can also use a foreach loop to traverse the entire array and take out each element:

foreach($arr as $foo) {
    echo $foo->value . "\n";
}

Of course, if your array Different types of objects are stored. You can also use the is_a() function to determine the type of each element:

class Bar {}

$bar = new Bar();

$arr = array($foo1, $bar);

foreach($arr as $item) {
    if (is_a($item, 'Foo')) {
        echo $item->value . "\n"; // 输出“hello”
    } else if (is_a($item, 'Bar')) {
        echo "This is an instance of Class Bar.\n";
    } else {
        echo "Unknown object type.\n";
    }
}

In the above code, we defined a class named Bar and created a new The instantiated object $bar. Then store the $foo1 and $bar objects in the $arr array. In the foreach loop, we use the is_a() function to determine the type of each element and output the corresponding prompt information.

To summarize, the above is how to get objects in PHP arrays. Through the above introduction, I believe you have understood how to use objects to store in arrays and retrieve each element in a PHP program.

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