PHP data type and structure analysis

PHP data types include scalar types (integers, floating point numbers, strings, Boolean values) and composite data types (arrays, objects). Data can be converted using functions such as settype(), intval(), floatval(), strval(), etc. PHP provides a wealth of practical examples, such as calculating the sum of integers in an array, extracting floating point numbers from strings, and creating and using objects.

PHP data type and structure analysis

Introduction
The data type is the data stored in PHP basic unit. Understanding the different types of data is important as it will determine how to effectively manipulate and process the data. This article will explore in detail the common types in PHP and some practical cases.

Scalar type

• Integer (int): composed of positive and negative integers.
• Floating point number (float): represents a number with a decimal point.
• String (string): consists of a sequence of characters, surrounded by single quotes (') or double quotes (").
• Boolean value (bool): the value is True or False, Represents true or false respectively

Composite data type

• Array: an ordered data collection consisting of key-value pairs. Composition.
• Object: An entity that encapsulates data, consisting of properties and methods

##Data conversion##PHP. Functions are provided to convert different types of data:

##settype()

: Force the variable to the specified type
• intval().
: Convert the value to an integer.
• ##floatval(): Convert the value to a floating point number.
• ##strval(): Convert the value to an integer. Convert the value to a string.
• Practical case

Calculate the sum of the integer array

$numbers = [1, 3, 5, 7, 9];
$sum = 0;
foreach ($numbers as $number) {
    $sum += $number;
}
echo "总和：$sum";

Extract a floating point number from a string

$price = "12.50 USD";
$price = floatval(trim($price, " USD"));
echo "价格：$price 美元";

A simple object

class Person {
    public $name;
    public $age;

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

    public function sayHello() {
        echo "大家好，我叫 $this->name，今年 $this->age 岁。";
    }
}
$person = new Person("小明", 25);
$person->sayHello();

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