echo "当 🐋 前 🦄 时 🦆 间: " . date("Ymd H:i:s");

需要注 🐳 意 🕸 的 🦈 点：

PHP 代码 🐴 必须 🌵 嵌入在 HTML 文 🦟 档中。

PHP 代 PHP 码必 🍁 须位于块内 🦟 ，以 `` 标 🐼 签包围。

PHP 代码必 🕸 须位于服务器上 🦆 ，并且必须由服务器 Web 解释。

如果 Web 服务 🦉 器未配置为 🐋 处理 PHP 代码 🦊 ，则 PHP 代码将作为纯文本输出。

允许 🐎 在 HTML 文档中执行服务器端操作。

方便地生成动态内容 🌺 ，例 ☘ 如数据库驱动的页面。

有 🐘 助于 🦆 实现复杂的网站功能。

代码可读性和可 🦢 维护性可能较差。

可能导致安全问题 🌿 ，如果 PHP 代码未正确保护。

可能 🌷 使调试更加困难。

将 PHP 代码模块 🦊 化并将其存储在单独的文 🐞 件 🌻 中。

使用 PHP 模 PHP 板引擎来帮助 🌷 组织和 🌴 结构化代码。

确保 PHP 代 🐵 码安全可靠，并且不 🌷 会产生任何漏洞。

使用 PHPlint 等工具来 🌵 检查 🐴 和 🐋 分析 PHP 代码的语法和安全性。

2、php是 🐯 什么意思 🌺

PHP 是一种服务器端脚本语言，广泛 🌻 用于 Web 开发。

PHP 是一 🐬 个 🌸 缩写，代表：

P： 超文本预处 🦋 理 🕸 (Hypertext Preprocessor)

H： 这种语言最早是由一 🐱 种名为 PHP/FI 的语言演变而来的，那里 F 代表 Form Interpretation。

P： 后来，将其更名为 PHP，即 PHP：一 🦋 种个人主页 🌵 工具 (PHP: Hypertext Preprocessor)。

3、php div

The PHP `div` function is used to divide two numbers. It returns the integer part of the division, which is the quotient of the two numbers.

Syntax:

php

div(number1, number2)

Parameters:

number1: The dividend.

number2: The divisor.

Return Value:

The integer part of the division of number1 by number2.

Example:

php

echo div(10, 3); // 3

echo div(11, 3); // 3

echo div(12, 3); // 4

4、php dio

php dio

Description:

The `dio` extension in PHP provides functionality for reading and writing to various input and output streams, including files, sockets, pipes, and other resources. It offers a lowlevel interface for managing file operations and data streams.

Installation:

The `dio` extension is not part of the standard PHP distribution. You need to install it using PECL (PHP Extension Community Library):

pecl install dio

Features:

File and Stream Management: Open, read, write, and close files.

Data Manipulation: Read and write data to and from streams.

Stream Filtering: Modify the data flowing through a stream before or after being read/written.

Socket Communication: Create and manage client and server sockets for network communication.

Pipe Management: Create and handle pipes for interprocess communication.

Device Access: Read and write data to physical devices such as serial ports and named pipes.

Usage:

php

// Open a file for writing

$file = dio_open('data.txt', O_WRONLY | O_CREAT);

// Write to the file

dio_write($file, 'Hello world!');

// Close the file

dio_close($file);

// Read from a file

$file = dio_open('data.txt', O_RDONLY);

$data = dio_read($file, 10); // Read 10 bytes

// Create a socket

$sock = dio_socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// Connect to a remote host

dio_socket_connect($sock, 'example.com', 80);

// Send data through the socket

dio_socket_write($sock, 'GET / HTTP/1.1\r\n');

// Read data from the socket

$data = dio_socket_read($sock, 1024);

// Create a pipe

$pipes = dio_pipe();

// Write to the write end of the pipe

dio_write($pipes[1], 'Hello pipe!');

// Read from the read end of the pipe

$data = dio_read($pipes[0], 10);

Constants:

`O_RDONLY`: Open file for reading only

`O_WRONLY`: Open file for writing only

`O_RDWR`: Open file for reading and writing

`O_CREAT`: Create file if it does not exist

`O_TRUNC`: Truncate file to zero length

`O_APPEND`: Write to the end of file

`O_EXCL`: Create file only if it does not exist

`O_NOCTTY`: Do not make file a controlling terminal

`O_SYNC`: Open file in synchronous mode

`O_NONBLOCK`: Open file in nonblocking mode

Functions:

`dio_open`: Open a file

`dio_read`: Read data from a stream

`dio_write`: Write data to a stream

`dio_close`: Close a stream

`dio_socket_create`: Create a socket

`dio_socket_connect`: Connect a socket to a remote host

`dio_socket_write`: Write data through a socket

`dio_socket_read`: Read data from a socket

`dio_pipe`: Create a pipe

`dio_stream_filter`: Apply a filter to a stream

Additional Resources:

[PHP dio Extension Documentation]()

[PHP Stream Wrappers and dio]()

[dio Extension on GitHub]()