<?php
$connect = mysqli_connect('localhost','root','','volunteer') or die('Unale to connect');
$sql = "select * from vol_msg";
$result = mysqli_query($connect,$sql);
while($row = mysqli_fetch_row($result)){
echo $row[0];
}
?>

<?php
//創(chuàng)建對象并打開連接，最后一個參數(shù)是選擇的數(shù)據(jù)庫名稱
$mysqli = new mysqli('localhost','root','','volunteer');
//檢查連接是否成功
if (mysqli_connect_errno()){
//注意mysqli_connect_error()新特性
die('Unable to connect!'). mysqli_connect_error();
}
$sql = "select * from vol_msg";
//執(zhí)行sql語句，完全面向對象的
$result = $mysqli->query($sql);
while($row = $result->fetch_array()){
echo $row[0];
}
?>