How to convert object array in php

In PHP, converting an array to an object is a very common operation, and converting an object to an array is equally common. Because arrays and objects in PHP are very powerful data structures, they are widely used in developing applications and websites. In this article, we will explore how to convert a PHP array to an object, how to convert an object to an array, and how to convert between these two data structures.

Convert PHP array to object

Converting PHP array to object is very simple, just use the stdClass class provided in PHP. The stdClass class is a standard class built into PHP and is a very powerful object. We can use the stdClass class to create an empty object and then dynamically add properties and methods to the object.

The following is a code example to convert a PHP array to an object:

// 定义一个 PHP 数组
$array = array(
    'name' => 'Alice',
    'age' => 28,
    'gender' => 'female'
);

// 将 PHP 数组转换为对象
$obj = (object) $array;

In the above code, we first define a PHP array. Next, we use the PHP type conversion operator (object) to convert the array to an object, and assign the converted object to the $obj variable.

After the above code is executed, we get an object named $obj, which contains all the elements in the original array as attributes. We can access these properties by using the object property accessor:

echo $obj->name; // 输出：Alice
echo $obj->age; // 输出：28
echo $obj->gender; // 输出：female

In the above code, we use the object property accessor to access the properties of the $obj object and output their values.

In addition, we can also use the var_dump() function to print the object’s property and method list:

var_dump($obj);

This will output the following results:

object(stdClass)#1 (3) {
  ["name"]=>
  string(5) "Alice"
  ["age"]=>
  int(28)
  ["gender"]=>
  string(6) "female"
}

This output tells us that the $obj object has three attributes, namely name, age and gender.

When we need to dynamically add properties to an object, we can use the object property accessor to complete it. For example, we can add the following code to the above example:

$obj->city = 'Shanghai';

This will dynamically add a property named city to the $obj object and set it The value is set to 'Shanghai'.

Convert a PHP object to an array

Similar to converting a PHP array to an object, converting a PHP object to an array is also very simple. You can use a cast operator (array) provided by the PHP language to convert an object into an array:

// 定义一个 PHP 对象
$obj = new stdClass();
$obj->name = 'Alice';
$obj->age = 28;
$obj->gender = 'female';

// 将 PHP 对象转换为数组
$array = (array) $obj;

In the above code, we first define a PHP object. Next, we use the PHP type conversion operator (array) to convert the object to an array and assign the converted array to the $array variable.

After the above code is executed, we get an $array array, which contains all the attributes in the original object as array elements. We can access these properties using the array element accessor:

echo $array['name']; // 输出：Alice
echo $array['age']; // 输出：28
echo $array['gender']; // 输出：female

In the above code, we use the array element accessor to access the elements of the $array array and output their values.

In addition, we can also use the var_dump() function to print the array:

var_dump($array);

This will output the following results:

array(3) {
  ["name"]=>
  string(5) "Alice"
  ["age"]=>
  int(28)
  ["gender"]=>
  string(6) "female"
}

This The segment output tells us that the $array array has three elements, name, age, and gender.

Convert objects in arrays to arrays

When we process arrays in PHP, we often encounter nested arrays containing objects. In this case we need to convert the object to an array. This is also very simple, we just need to recursively access the nested data structure and convert the object into an array.

The following is a code example to convert an object in an array to an array:

// 定义一个嵌套的 PHP 数组
$array = array(
    'name' => 'Alice',
    'age' => 28,
    'address' => array(
        'city' => 'Shanghai',
        'street' => 'Huai Hai Road',
        'zip' => '200000'
    ),
    'skills' => array(
        new stdClass(),
        new stdClass(),
        new stdClass()
    )
);

// 将数组中的对象转换为数组
function objectToArray($data) {
    if (is_array($data) || is_object($data))
    {
        $result = array();
        foreach ($data as $key => $value)
        {
            $result[$key] = objectToArray($value);
        }
        return $result;
    }
    return $data;
}

$array = objectToArray($array);

In the above code, we define a nested PHP array and add an array named skills array, which contains three stdClass objects.

Next, we define a function named objectToArray(), which is used to recursively access all elements in the array and convert the objects in it to an array.

In this function, we first determine whether the incoming parameter $data is an array or object. If so, create an empty array $result and iterate over each element in the array or object. For each element, we recursively pass it to the objectToArray() function and assign the return value to the $result array.

Finally, when the recursive process ends, we return the $result array or raw data, depending on the type of the parameter $data passed in.

After the objectToArray() function is defined, we use this function to convert all objects in the $array array into arrays. After the conversion is complete, we can use the array element accessor to access all elements in the $array array.

Summary

In this article, we learned how to convert a PHP array to an object, how to convert an object to an array, and how to convert between these two data structures. In daily development, we often need to deal with these two data structures, so it is very important to be proficient in the conversion between them.

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