How to convert data into array in php

PHP is a very popular server-side development language that is widely used in website development, web application development, and various other projects. In PHP programming, converting data into an array is a basic operation. This article will explain how to convert PHP data to an array and provide some common examples.

1. PHP data types

In PHP programming, the common data types are the following:

• String (String)
• Integer type (Integer)
• Float type (Float)
• Boolean type (Boolean)
• Array (Array)
• Object (Object)
• Empty (Null)
• Resource type (Resource)

Among them, array is a special data type, which can be used to store a Group related data.

2. PHP data conversion into arrays

In PHP, you can use a variety of methods to convert data into arrays. These methods are introduced below.

(1) Convert a string into an array

You can use the explode() function to split the string into an array. This function requires two parameters: the first parameter specifies the delimiter, and the second parameter specifies the string to be split. For example:

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

The output is:

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

In the above example, we use comma as the delimiter to split the string into an array.

(2) Convert JSON data into an array

You can use the json_decode() function to convert JSON data into an array. This function requires one parameter, the JSON string to be converted. For example:

$json_str = '{"name":"John","age":30,"city":"New York"}';
$arr = json_decode($json_str, true);
print_r($arr);

The output result is:

Array(
    [name] => John
    [age] => 30
    [city] => New York
)

In the above example, we convert the JSON string into an array and use the print_r() function to print out the array contents.

(3) Convert the object to an array

You can use the get_object_vars() function to convert the object to an array. This function requires one parameter, the object to be converted. For example:

class Person {
    public $name;
    public $age;
    public $city;
}

$person = new Person();
$person->name = "John";
$person->age = 30;
$person->city = "New York";

$arr = get_object_vars($person);
print_r($arr);

The output is:

Array(
    [name] => John
    [age] => 30
    [city] => New York
)

In the above example, we created a Person object and converted it into an array.

(4) Convert XML data to an array

You can use the SimpleXMLElement class to convert XML data to an array. For example:

$xml_str = '<person>
    <name>John</name>
    <age>30</age>
    <city>New York</city>
</person>';

$xml = new SimpleXMLElement($xml_str);
$json_str = json_encode($xml);
$arr = json_decode($json_str, true);
print_r($arr);

The output is:

Array(
    [name] => John
    [age] => 30
    [city] => New York
)

In the above example, we convert the XML string to a SimpleXMLElement object, then convert it to a JSON string, and finally use json_decode( ) function to convert it to an array.

3. Summary

In PHP programming, converting data into an array is a very basic operation and is often used for data processing and data format conversion. Four common methods are introduced above, including converting strings, JSON data, objects, and XML data into arrays. In practical applications, appropriate methods can be selected to achieve data conversion according to specific needs.

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