Mac電腦上使用PHP訪問MySQL數(shù)據(jù)庫，需要進行以下幾個步驟：

1. 安裝MySQL

//使用Homebrew安裝
brew install mysql

2. 啟動MySQL

//使用命令行啟動
mysql.server start

3. 創(chuàng)建數(shù)據(jù)庫和表

//進入MySQL命令行
mysql -u root -p
//創(chuàng)建一個名為test的數(shù)據(jù)庫
CREATE DATABASE test;
//切換到test數(shù)據(jù)庫
USE test;
//創(chuàng)建一個名為users的表
CREATE TABLE users(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

4. 安裝PHP的MySQL擴展

//使用Homebrew安裝PHP
brew install php
//安裝MySQL擴展
brew install php-mysql

5. 編寫PHP代碼連接數(shù)據(jù)庫

//連接MySQL數(shù)據(jù)庫
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "test";
$conn = new mysqli($servername, $username, $password, $dbname);
//檢測連接是否成功
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";

通過上述步驟，Mac電腦上的PHP程序就可以訪問MySQL數(shù)據(jù)庫了。