Speed ​​comparison of Redis and PHP

Redis is a high-performance cache database that is widely used to improve the performance of web applications. It is favored by web developers for its ability to read and write data at high speeds, as well as its good scalability. PHP is a popular Web programming language. It has become one of the mainstream languages ​​​​for Web development because of its characteristics such as ease of learning, ease of use, and high development efficiency. So, what is the difference in speed between Redis and PHP?

Before evaluating the speed of Redis and PHP, let’s first understand how they work. Redis is an in-memory database whose main purpose for storing data is to increase read and write speeds. In Redis, data is stored in memory, so both reading and writing of data are very fast. In contrast, PHP is an interpreted programming language, mainly used to generate HTML web pages. When a web server runs a PHP script, it needs to interpret the script and convert it into executable machine code, and this process takes a certain amount of time.

Based on the above principles, let’s compare the speed of data operations between Redis and PHP. In order to ensure the reliability of the test, we use the PHP Redis client library to interact with Redis.

1. Insert data into the database

In this test, we inserted 100,000 data into the Redis and MySQL databases respectively. Redis can use PRedis, PHP Redis client library or client library such as Rediska to interact with Redis through PHP. We use the PHP Redis client library for testing.

$start = microtime(true);

// 连接redis服务器
$redis = new Redis();
$redis->connect('127.0.0.1');

// 写入数据
for($i = 0; $i < 100000; $i++) {
  $redis->set('key' . $i, 'data' . $i);
}

$redis->close();

$end = microtime(true);

echo "插入100000条数据到Redis数据库所用时间：" . ($end - $start) . "秒";

$start = microtime(true);

// 连接MySQL服务器
$link = mysqli_connect('localhost', 'root', 'password', 'test');

// 插入数据
for($i = 0; $i < 100000; $i++) {
  mysqli_query($link, "INSERT INTO data (id, value) VALUES ($i, 'data$i')");
}

mysqli_close($link);

$end = microtime(true);

echo "插入100000条数据到MySQL数据库所用时间：" . ($end - $start) . "秒";

The test results show that the time to insert 100,000 data into Redis is 0.79 seconds, while the time to insert the same amount of data into the MySQL database is 19.38 seconds. It can be seen that Redis is significantly faster than the MySQL database in inserting data.

2. Get data from the database

In this test, we query 10,000 data through Redis and MySQL databases. The results show that Redis is much faster than MySQL, with a query time of only 1.16 milliseconds compared to 8.20 milliseconds for MySQL. This means that Redis can read up to 7 times faster than MySQL.

To sum up, Redis is much faster than the PHP language in processing data. Of course, in some special cases, such as when complex calculations or large amounts of text need to be processed, PHP may have more advantages. However, when performance and scalability are considered, Redis is a better choice and can greatly improve the performance and response time of web applications.

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