Hvordan skal jeg undslippe tegn i denne LIKE-forespørgsel?

Fra MySQL Manual :

Så du bør escape streng for LIKE operatør i to trin.

I PHP kan det være sådan her:

// Your search string, for example, from POST field
$string = $_POST['column'];

// First step - LIKE escaping
$string = str_replace(array('\\', '_', '%'), array('\\\\', '\\_', '\\%'), $string);

// Second step - literal escaping
$string = mysql_real_escape_string($string);

// Result query
mysql_query("SELECT * FROM `table` WHERE `column` LIKE '%".$string."%'");

OPDATERING:

Brug MySQLi

// Connect to database
$mysqli = new mysqli('localhost', 'username', 'password', 'database');

// Your search string, for example, from POST field
$string = $_POST['column'];

// First step - LIKE escaping
$string = str_replace(['\\', '_', '%'], ['\\\\', '\\_', '\\%'], $string);

// Second step - literal escaping
$string = $mysqli->real_escape_string($string);

// Result query
$mysqli->query("SELECT * FROM `table` WHERE `column` LIKE '%{$string}%'");

Brug PDO

// Connect to database
$conn = new PDO('mysql:host=localhost;dbname=database', 'username', 'password');

// Your search string, for example, from POST field
$string = $_POST['column'];

// First step - LIKE escaping
$string = str_replace(['\\', '_', '%'], ['\\\\', '\\_', '\\%'], $string);

// Second step - literal escaping
$string = $conn->quote($string);

// Result query
$conn->query("SELECT * FROM `table` WHERE `column` LIKE '%{$string}%'");

Eller du kan bruge PDO udarbejdet erklæring , i stedet for andet trin (bogstavelig escape):

// Connect to database
$conn = new PDO('mysql:host=localhost;dbname=database', 'username', 'password');

// Your search string, for example, from POST field
$string = $_POST['column'];

// First step - LIKE escaping
$string = str_replace(['\\', '_', '%'], ['\\\\', '\\_', '\\%'], $string);

// Prepare a statement for execution
$statement = $conn->prepare("SELECT * FROM `table` WHERE `column` LIKE ?");

// Execute a prepared statement
$statement->execute(["%{$string}%"]);