Preventing SQL Injection Attacks

by Dave on November 2nd, 2007

<?php

if (isset($_POST['product_name']) && isset($_POST['product_description']) && isset($_POST['user_id'])) {
// Connect

$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password');

if(!is_resource($link)) {

echo "Failed to connect to the server\n";
// ... log the error properly

} else {

// Reverse magic_quotes_gpc/magic_quotes_sybase effects on those vars if ON.

if(get_magic_quotes_gpc()) {
$product_name? ? ? ? = stripslashes($_POST['product_name']);
$product_description = stripslashes($_POST['product_description']);
} else {
$product_name? ? ? ? = $_POST['product_name'];
$product_description = $_POST['product_description'];
}

// Make a safe query
$query = sprintf("INSERT INTO products (`name`, `description`, `user_id`) VALUES ('%s', '%s', %d)",
mysql_real_escape_string($product_name, $link),
mysql_real_escape_string($product_description, $link),
$_POST['user_id']);

mysql_query($query, $link);

if (mysql_affected_rows($link) > 0) {
echo "Product inserted\n";
}
}
} else {
echo "Fill the form properly\n";
}
?>

From → PHP

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