How to connect to database in PHP7

Recommended (free): PHP7

* Already in PHP7 The mysql library is abolished, so you can only use mysqli and PDO

<?php$serve = &#39;localhost:3306&#39;;$username = &#39;root&#39;;$password = &#39;admin123&#39;;$dbname = &#39;examples&#39;;$mysqli = new Mysqli($serve,$username,$password,$dbname);if($mysqli->connect_error){
	die(&#39;connect error:&#39;.$mysqli->connect_errno);}$mysqli->set_charset(&#39;UTF-8&#39;); // 设置数据库字符集$result = $mysqli->query(&#39;select * from customers&#39;);$data = $result->fetch_all(); // 从结果集中获取所有数据print_r($data);

 ?>

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<?php$serve = &#39;localhost:3306&#39;;$username = &#39;root&#39;;$password = &#39;admin123&#39;;$dbname = &#39;examples&#39;;$link = mysqli_connect($serve,$username,$password,$dbname);mysqli_set_charset($link,&#39;UTF-8&#39;); // 设置数据库字符集$result = mysqli_query($link,&#39;select * from customers&#39;);$data = mysqli_fetch_all($result); // 从结果集中获取所有数据print_r($data);

 ?>

Copy after login

<?php$serve = &#39;mysql:host=localhost:3306;dbname=examples;charset=utf8&#39;;$username = &#39;root&#39;;$password = &#39;admin123&#39;;try{ // PDO连接数据库若错误则会抛出一个PDOException异常
	$PDO = new PDO($serve,$username,$password);
	$result = $PDO->query(&#39;select * from customers&#39;);
	$data = $result->fetchAll(PDO::FETCH_ASSOC); // PDO::FETCH_ASSOC表示将对应结果集中的每一行作为一个由列名索引的数组返回
	print_r($data);} catch (PDOException $error){
	echo &#39;connect failed:&#39;.$error->getMessage();}

 ?>

Copy after login

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