How to convert variables into arrays in php

In PHP, variables can be converted into arrays to make data processing more convenient and efficient. Below we will explain in detail how to convert variables of different types into arrays.

1. Convert a string into an array

1.1 Use the explode function

The explode function can split a string into an array according to the specified delimiter. The sample code is as follows:

$str = "apple,banana,orange";
$arr = explode(",", $str);
print_r($arr);

Output result:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

1.2 Use str_split function

str_split function can split a string into an array of single characters. The sample code is as follows:

$str = "Hello, PHP!";
$arr = str_split($str);
print_r($arr);

Output result:

Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] => ,
    [6] =>  
    [7] => P
    [8] => H
    [9] => P
    [10] => !
)

2. Convert numbers, Boolean values ​​or null into arrays

2.1 Use conversion characters

You can use conversion characters to convert numbers, Boolean values ​​or Convert null into an array. The sample code is as follows:

$num = 123;
$arr = (array)$num;
print_r($arr);

$bool = true;
$arr = (array)$bool;
print_r($arr);

$null = null;
$arr = (array)$null;
print_r($arr);

Output result:

Array
(
    [0] => 123
)
Array
(
    [0] => 1
)
Array
(
)

3. Convert the object into an array

3.1 Use the get_object_vars function

get_object_vars The function can convert the object into an associative array, where the key name is the object attribute name. The sample code is as follows:

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

$person = new Person("Tom", 18);
$arr = get_object_vars($person);
print_r($arr);

Output result:

Array
(
    [name] => Tom
    [age] => 18
)

3.2 Nested use conversion

If Object attribute values ​​are also objects and can be converted into arrays using recursive calls. The sample code is as follows:

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

class Address {
  public $country;
  public $city;
  public function __construct($country, $city) {
    $this->country = $country;
    $this->city = $city;
  }
}

$address = new Address("China", "Beijing");
$person = new Person("Tom", 18, $address);

$arr = (array)$person;
if (is_object($person->address)) {
  $arr["address"] = (array)$person->address;
}

print_r($arr);

Output results:

Array
(
    [name] => Tom
    [age] => 18
    [address] => Array
        (
            [country] => China
            [city] => Beijing
        )
)

The above is the method for converting variables into arrays. I hope it can be useful for You helped!

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