1、手动转义
<?php
// PDO, "manual" escaping
$username = PDO::quote($_GET['username']);
$pdo->query("SELECT * FROM users WHERE username = $username");
// mysqli, "manual" escaping
$username = mysqli_real_escape_string($_GET['username']);
$mysqli->query("SELECT * FROM users WHERE username = '$username'");
上面采用了PDO和MySQLi的API自带的函数对获取到的参数的值进行了转义。
2、prepared statement参数绑定
下面推荐更加高效安全的prepared statement参数绑定的方式：<?php
// PDO, prepared statement
$pdo->prepare('SELECT * FROM users WHERE username = :username');
$pdo->execute(array(':username' => $_GET['username']));
// mysqli, prepared statements
$query = $mysqli->prepare('SELECT * FROM users WHERE username = ?');
$query->bind_param('s', $_GET['username']);
$query->execute();
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