PHP high concurrency spike solution

This article provides a PHP high concurrency spike solution (add three case descriptions (normal process, use file lock, use redis message queue))

1: (normal process, do not do any high concurrency processing), the code is as follows:

<?php

$_mysqli = new mysqli('localhost','root','','secondkill');

if (mysqli_connect_errno()) {
	echo mysqli_connect_error();
	exit();
}
$_mysqli->set_charset('utf8');

$_sql = "select stock from goods where id=1";

$_result = $_mysqli->query($_sql);

$_assoc = $_result->fetch_assoc();

if($_assoc['stock']>0){
	$_sql = "UPDATE goods SET stock=stock-1 WHERE id=1";
	$_mysqli->query($_sql);

}

$_mysqli->close();

?>

1: (using file lock), the code is as follows:

<?php


$_mysqli = new mysqli('localhost','root','','secondkill');

if (mysqli_connect_errno()) {
	echo mysqli_connect_error();
	exit();
}
$_mysqli->set_charset('utf8');

$_sql = "select stock from goods where id=2";

$_result = $_mysqli->query($_sql);

$_assoc = $_result->fetch_assoc();

$fp = fopen("lock.txt", "w+");
if(!flock($fp,LOCK_EX | LOCK_NB)){
	echo "The system is busy, please try again later";
	return;
}

if($_assoc['stock']>0){
	$_sql = "UPDATE goods SET stock=stock-1 WHERE id=2";
	if($_mysqli->query($_sql)){
		flock($fp,LOCK_UN);//Release the lock
	}

}

fclose($fp);
$_mysqli->close();



?>

3: Use redis message queue, the code is as follows:

<?php

$redis=new Redis();
$result=$redis->connect('127.0.0.1',6379);

$_mysqli = new mysqli('localhost','root','','secondkill');

if (mysqli_connect_errno()) {
	echo mysqli_connect_error();
	exit();
}
$_mysqli->set_charset('utf8');

/*
for($i=1;$i<=100;$i++){
	$redis->lpush('goods_nums',$i); //Before the seckill starts, first store the inventory quantity in the queue, cooperate with scheduled tasks, and tentatively set the inventory to 100
}

echo $redis->llen('goods_nums');
exit();
*/

$check = $redis->lpop('goods_nums');

//echo $check;

if($check){
	echo "Seckill success";
	$_sql = "UPDATE goods SET stock=stock-1 WHERE id=3";
	$_mysqli->query($_sql);
	return;
} else {
	echo "Seckill failed";
}


?>

PHP high concurrency spike solution

Guess you like