How to convert data to array type in php

PHP is a dynamically typed language that often requires type conversion between different data types. One of the most common type conversions is converting other types to arrays.

In PHP, there are many ways to convert other types to arrays. The following are several common ways:

1. Use (array) cast type conversion

In PHP, use (array) to convert other types to arrays. This method is simple and fast, but has some unpredictable results.

For example, we can convert an integer into an array containing only that integer:

$num = 123;
$arr = (array) $num;
print_r($arr); // 输出：Array([0] => 123)

It is worth noting that if an object is cast to an array, the public properties of the object will be used Properties serve as array keys, private properties are ignored.

2. Use typecast operator

Use typecast operator to convert other types into arrays. This operator was introduced in the PHP4 version and is more readable than using an (array) cast.

For example, we can convert a string into an array:

$str = "Hello World";
$arr = (array) $str;
print_r($arr); // 输出：Array([0] => Hello World)

$arr2 = (array) $str;
print_r($arr2); // 输出：Array([0] => Hello World)

3. Use (array) to convert the object

When using (array) to convert the object When converting to an array, PHP will use the public and protected properties of the object as the keys of the array.

For example, here is a sample program to convert an object to an array:

class Person {
  public $name;
  public $age;

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

$person = new Person("Tom", 25);
$arr = (array) $person;
print_r($arr); // 输出：Array([name] => Tom, [age] => 25)

4. Convert using functions

PHP also provides some built-in functions Other types can be converted to arrays, such as explode(), str_split(), etc. These functions can split a string into individual characters or into array elements using a given delimiter.

For example, here is a sample program that converts a string to an array:

$str = "hello world";
$arr = str_split($str);
print_r($arr); // 输出：Array([0] => h, [1] => e, [2] => l, [3] => l, [4] => o, [5] => , ...)

Summary

In PHP, converting other types to arrays is a common Task. This article describes several ways to convert other types to arrays. Pay attention to the consistency of data types and data structures when converting to ensure good results.

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