mysql真正的转义字符串解决sql注入绝对[重复]

Question

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• How can I prevent SQL injection in PHP? 28 answers

I want to know if I add mysql_real_escape_string to my variables that's enough to solve sql injection

$get_id = "select * from `book` where id='".$mysqli->real_escape_string($id)."' limit 1";

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Answer 1

No, it isn't. Use prepared statements.

You would have to do something like this:

// Your connection settings
$connData = ["localhost", "user", "pass", "database"];

$conn = new mysqli($connData[0], $connData[1], $connData[2], $connData[3]);
$conn->set_charset("utf8");

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Here we explain MySQL which will be the query
$stmt = $conn->prepare("select * from book where id=? limit 1");

// Here we tell PHP which variable hash de "?" value. Also you tell PHP that $id has an integer ("i")
$stmt->bind_param("i", $id);

// Here we bind the columns of the query to PHP variables
$stmt->bind_result($column1, $column2, ...); // <--- Whichever columns you have

// Here we execute the query and store the result
$stmt->execute();
$stmt->store_result();

// Here we store the results of each row in our PHP variables ($column1, column2, ...)
while($stmt->fetch()){
    // Now we can do whatever we want (store in array, echo, etc)
    echo "<p>$column1 - $column2 - ...</p>";
}

$stmt->close();
$conn->close();