PHP8深入解析大数据类型：全面认识其丰富的数据存储方式

$string1 = "Hello";
$string2 = "World";
$result = $string1 . $string2; // 结果为 "HelloWorld"

$string = "Hello World";
$length = strlen($string); // 结果为 11

$string = "Hello World";
$substring = substr($string, 0, 5); // 结果为 "Hello"

$number1 = 10;
$number2 = 5;
$result = $number1 + $number2; // 结果为 15

$number1 = 10;
$number2 = 5;
if ($number1 > $number2) {
    echo "Number1 is greater than Number2";
}

$number1 = 3.14;
$number2 = 2.71;
$result = $number1 + $number2; // 结果为 5.85

$number1 = 3.14;
$number2 = 3.141;
if (round($number1, 2) == round($number2, 2)) {
    echo "Number1 is equal to Number2";
}

$bool1 = true;
$bool2 = false;
$result = $bool1 && $bool2; // 结果为 false

$score = 80;
if ($score >= 60) {
    echo "You passed the exam";
} else {
    echo "You failed the exam";
}

$fruits = array("apple", "banana", "orange");

$fruits = array("apple", "banana", "orange");
echo $fruits[0]; // 输出 "apple"

$fruits = array("apple", "banana", "orange");
foreach ($fruits as $fruit) {
    echo $fruit;
}

class Person {
    public $name;
    public function sayHello() {
        echo "Hello, my name is " . $this->name;
    }
}
$person = new Person();
$person->name = "John";
$person->sayHello(); // 输出 "Hello, my name is John"

class Person {
    public $name;
}
$person = new Person();
$person->name = "John";
echo $person->name; // 输出 "John"

$file = fopen("file.txt", "r");
// 使用$file进行文件读写操作
fclose($file);

$name = NULL;