How to deal with php array objects

Arrays in PHP are a very powerful data type. They allow us to store and process various types of data, including strings, integers, floating point numbers, Boolean values, etc. In PHP, arrays can be regular arrays or arrays like objects. This kind of array is like an object, each element has its own properties and methods, that is, accessors and mutators. In this article, we will learn how to use PHP array objects for data processing.

1. What is an array object?

First, let us understand the concept of array objects. Array objects refer to arrays that can store multiple data in PHP, and each data can be an object. An array object is similar to an ordinary array, but each element can have its own properties and methods. In PHP, array objects are often used as a collection of related objects.

2. Creating an array object

Creating an array object is very simple, just use the array() function. For example:

$students_array = array(
    array('name' => '小明', 'age' => 18, 'score' => array(80,90,95)),
    array('name' => '小红', 'age' => 19, 'score' => array(85,86,90)),
    array('name' => '小王', 'age' => 20, 'score' => array(75,70,80))
);

The above code creates an array object containing three student information. Each student information contains name, age and score, and the score attribute is an array containing three elements.

3. Accessing array objects

The way to access array objects is similar to accessing ordinary arrays. You can use array subscripts to read and write elements. For example:

echo $students_array[0]['name']; //输出 小明
echo $students_array[1]['score'][1]; //输出 86

Here you access the properties of the array object elements by specifying the array subscript. In the first example, the name of the first student is accessed, and in the second example, the second subject score of the second student is accessed.

4. Modify the array object

Contrary to access, to modify the elements of the array object, we need to assign the new value to the original variable. For example:

$students_array[2]['score'][0] = 80;

Here, the third student’s first subject score is modified to 80 points.

5. Methods in array objects

Methods in array objects are similar to methods in objects, and we can use arrow symbols to call them. For example:

class student{
   private $name;//私有
   private $age;//私有
   private $score;//私有

   function __construct($name, $age, $score){
      $this->name = $name;
      $this->age = $age;
      $this->score = $score;
   }

    //可访问器方法
    function getName(){
       return $this->name;
    }

    //可变器方法
    function setName($name){
       $this->name = $name;
    }
}

$student1 = new student("小明",18,array(80,90,95));//实例化student对象

echo $student1->getName();//使用可访问器方法获取姓名 小明
$student1->setName("小红");//使用可变器方法修改姓名
echo $student1->getName();//输出 小红

The above code defines a student class student, which contains three private properties: name, age and score, as well as an accessor method and a mutator method. Then an instantiated object student1 was created, the accessor method was used to obtain the name, the variable method was used to modify the name, and the name was obtained again.

6. Traverse array objects

Loops can be used to traverse array objects, including loop structures such as for, foreach, and while. For example:

//for循环方式
for($i=0;$i<count($students_array);$i++){
    echo $students_array[$i][&#39;name&#39;].&#39;: &#39;;
    foreach ($students_array[$i][&#39;score&#39;] as $value){
        echo $value.&#39; &#39;;
    }
    echo &#39;<br />';
}

//foreach循环方式
foreach($students_array as $student){
    echo $student['name'].': ';
    foreach($student['score'] as $value){
        echo $value.' ';
    }
    echo '<br />';
}

The above code uses for and foreach loops to traverse the array object and output the name and score of each student.

7. Conclusion

In PHP, the array object is a very powerful data type that can be used to handle various types of data. Array objects can store the properties and methods of corresponding objects, and maintain and modify data through accessors and mutators. In actual development, we can make full use of array objects to simplify data processing logic and improve code readability and maintainability.

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