<?php

$db = [

'server' => 'localhost:3306',

'user' => 'root',

'password' => '',

'database' => 'blog_test',

];

$startTime = getmicrotime();

for ($i = 0; $i < 1000; $i++) {

$mysqli = new mysqli($db["server"], $db["user"], $db["password"], $db["database"]); //持久连接

$mysqli->close();

}

echo bcsub(getmicrotime(), $startTime, 10), PHP_EOL;

// 6.5814000000

$mysqli = null;

$startTime = getmicrotime();

for ($i = 0; $i < 1000; $i++) {

$mysqli = new mysqli('p:' . $db["server"], $db["user"], $db["password"], $db["database"]); //持久连接

$mysqli->close();

}

echo bcsub(getmicrotime(), $startTime, 10), PHP_EOL;

// 0.0965000000

$startTime = getmicrotime();

for ($i = 0; $i < 1000; $i++) {

$pdo = new PDO("mysql:dbname={$db['database']};host={$db['server']}", $db['user'], $db['password']);

}

echo bcsub(getmicrotime(), $startTime, 10), PHP_EOL;

// 6.6171000000

$startTime = getmicrotime();

for ($i = 0; $i < 1000; $i++) {

$pdo = new PDO("mysql:dbname={$db['database']};host={$db['server']}", $db['user'], $db['password'], [PDO::ATTR_PERSISTENT => true]); //持久连接

}

echo bcsub(getmicrotime(), $startTime, 10), PHP_EOL;

// 0.0398000000

function getmicrotime()

}