Php Php 语法

[Yann]

1.变量声明和使用：

$name = "John";
$age = 25;
echo "My name is $name and I am $age years old.";

2.条件语句（if-else）：

$score = 85;
if ($score >= 60) {
echo "You passed the exam!";
} else {
echo "You failed the exam.";
}

3.循环语句（for）：

for ($i = 1; $i <= 5; $i++) {
echo "Number: $i<br>";
}

4.数组声明和访问：

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

5.函数声明和调用：

function greet($name) {
echo "Hello, $name!";
}
greet("Alice"); // 输出 "Hello, Alice!"

6.类声明和实例化：

class Person {
private $name;

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

public function greet() {
echo "Hello, my name is $this->name!";
    }
}

$person = new Person("John");
$person->greet(); // 输出 "Hello, my name is John!"

7.文件包含：

// 文件1.php
$variable = "Hello from file 1!";

// 文件2.php
include '1.php';
echo $variable; // 输出 "Hello from file 1!"

8.异常处理：

function divide($numerator, $denominator) {
if ($denominator == 0) {
throw new Exception("Division by zero error!");
    }
return $numerator / $denominator;
}

try {
echo divide(10, 0);
} catch (Exception $e) {
echo "Error: " . $e->getMessage();
}