PHP implements the method of querying mysql and caching it to redis

<?php 
$redis = new redis();
$redis->connect(&#39;127.0.0.1&#39;, 6379);
$blog = $redis->get(&#39;redisrow&#39;);
//如果$blog数组为空，则去数据库中查询，并加入到redis中
if(empty($blog)){
	echo "mysql";
	// Connect mysql server
	$mysql = new PDO("mysql:host=localhost;dbname=blog","root","",array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8")); 
	$rs = $mysql -> query("select * from tbl_post");
	//$row = $rs -> fetch();
	$i=0;
	while($row = $rs -> fetch()){
		$rows[$i][&#39;title&#39;]=$row[&#39;title&#39;];
		$rows[$i][&#39;content&#39;]=$row[&#39;content&#39;];
		$i=$i+1;
	}
	print_r($rows);
	$redisrow = json_encode($rows);
	$redis->setex(&#39;redisrow&#39;,&#39;100&#39;,$redisrow);
}else{
	$redisblog = json_decode($blog);
	echo "redis";
	print_r($redisblog);
}
?>