php教程：操作MySQL数据库之读取数据

从 MySQL 数据库读取数据 目录

MySQLi 目录

$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);
 
if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();

PDO(+ 预处理) 目录

$stmt = $conn->prepare("SELECT id, firstname, lastname FROM MyGuests"); 
$stmt->execute();
 
// 设置结果集为关联数组
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC); 
foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) { 
	echo $v;
}
    

// TableRows类，用于关联数组的表格形式输出
class TableRows extends RecursiveIteratorIterator {
    function __construct($it) { 
        parent::__construct($it, self::LEAVES_ONLY); 
    }
 
    function current() {
        return "<td style='width:150px;border:1px solid black;'>" . parent::current(). "</td>";
    }
 
    function beginChildren() { 
        echo "<tr>"; 
    } 
 
    function endChildren() { 
        echo "</tr>" . "\n";
    } 
} 

参考资料：

(1) 在 Linux 命令行中使用和执行 PHP 代码