具有不同参数计数的PHP PDO语句

Question

我最近开始使用php PDO来防止SQL注入，虽然我的语句有问题，但它会根据我通过URL传递的参数更改页面结果。我正在努力的部分是，如何在URL的cat_id添加到我的执行数组时，如何添加$_GET['cat_id']。这里有一个工作版本，但显然很容易SQL注入，预先感谢任何帮助！

PHP

$and = ''; 
if (isset($_GET['cat_id'])) { 
    $and = "AND art_cat_id = ".$_GET['cat_id']; 
} 

$statement_article = $db->prepare("SELECT * FROM app_articles WHERE art_sta_id = :art_sta_id $and ORDER BY art_date DESC"); 

$statement_article->setFetchMode(PDO::FETCH_ASSOC); 

$statement_article->execute(array(':art_sta_id' => "1")); 

这里就是我试过，但如果在URL中有cat_id失败

PHP

$and = ''; 
if (isset($_GET['cat_id'])) { 
    $and = "AND art_cat_id = :cat_id"; 
} 


$statement_article = $db->prepare("SELECT * FROM app_articles WHERE art_sta_id = :art_sta_id $and ORDER BY art_date DESC"); 

$statement_article->setFetchMode(PDO::FETCH_ASSOC); 

$statement_article->execute(array(':art_sta_id' => "1",':cat_id' => $_GET['cat_id'])); 

Answer 1

调整参数数组有一个时cat_id：

$and = ''; 
$params = array(':art_sta_id' => "1"); 

if (isset($_GET['cat_id'])) 
{ 
    $and = "AND art_cat_id = :cat_id" 
    $params[':cat_id'] = $_GET['cat_id']; 
} 

$statement_article = $db->prepare("SELECT * FROM app_articles WHERE art_sta_id = :art_sta_id $and ORDER BY art_date DESC"); 

$statement_article->setFetchMode(PDO::FETCH_ASSOC); 

$statement_article->execute($params);