Data security methods to prevent SQL injection in PHP
Mar 24, 2018 pm 05:56 PM
This time I will bring you a data security method for preventing SQL injection in PHP. What are the precautions for PHP anti-SQL injection data security? . The following is a practical case, let’s take a look.
The example in this article describes how to simply implement PHP to prevent SQL injection. Share it with everyone for your reference, the details are as follows:Method 1: execute and substitute parameters
<?php
if(count($_POST)!= 0) {
$host = 'aaa';
$database = 'bbb';
$username = 'ccc';
$password = '***';
$num = 0;
$pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);//創(chuàng)建一個pdo對象
foreach ($_POST as $var_Key =>?$var_Value)?{
????//獲取POST數(shù)組最大值
????$num?=?$num?+?1;
??}
??//下標(biāo)為i的數(shù)組存儲的是商品id,?下標(biāo)為j數(shù)組的存儲的是此商品的庫存
??for($i=0;$i<$num;$i=$i+2)
{
//庫存下標(biāo)
$j = $i+1;
//判斷傳遞過來的數(shù)據(jù)合法性
if(is_numeric(trim($_POST[$i])) && is_numeric(trim($_POST[$j]))){
//禁用prepared statements的仿真效果
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,?false);
??????//查詢數(shù)據(jù)庫中是否存在該ID的商品
??????//當(dāng)調(diào)用?prepare()?時，查詢語句已經(jīng)發(fā)送給了數(shù)據(jù)庫服務(wù)器，此時只有占位符???發(fā)送過去，沒有用戶提交的數(shù)據(jù)
??????$stmt?=?$pdo->prepare("select?good_id?from?delphi_test_content?WHERE?good_id?=??");
??????//當(dāng)調(diào)用到?execute()時，用戶提交過來的值才會傳送給數(shù)據(jù)庫，他們是分開傳送的，兩者獨立的，SQL攻擊者沒有一點機(jī)會。
??????$stmt->execute(array($_POST[$i]));
??????//返回查詢結(jié)果
??????$count?=?$stmt->rowCount();
??????//如果本地數(shù)據(jù)庫存在該商品ID和庫存記錄，就更新該商品的庫存
??????if($count?!=?0)
??????{
????????$stmt?=?$pdo->prepare("update?delphi_test_content?set?content?=???WHERE?good_id?=??");
????????$stmt->execute(array($_POST[$j],?$_POST[$i]));
??????}
??????//如果本地數(shù)據(jù)庫沒有該商品ID和庫存記錄，就新增該條記錄
??????if($count?==?0)
??????{
????????$stmt?=?$pdo->prepare("insert?into?delphi_test_content?(good_id,content)?values?(?,?)");
????????$stmt->execute(array($_POST[$i],?$_POST[$j]));
??????}
????}
??}
??$pdo?=?null;
??//關(guān)閉連接
}
?>
Method 2: bindParam binding parameter
<?php
if(count($_POST)!= 0) {
$host = 'aaa';
$database = 'bbb';
$username = 'ccc';
$password = '***';
$num = 0;
$pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);//創(chuàng)建一個pdo對象
foreach ($_POST as $var_Key =>?$var_Value)?{
????//獲取POST數(shù)組最大值
????$num?=?$num?+?1;
??}
??//下標(biāo)為i的數(shù)組存儲的是商品id,?下標(biāo)為j數(shù)組的存儲的是此商品的庫存
??for($i=0;$i<$num;$i=$i+2)
{
//庫存下標(biāo)
$j = $i+1;
//判斷傳遞過來的數(shù)據(jù)合法性(此數(shù)據(jù)為商品編號以及庫存，嚴(yán)格來說字符串全是由數(shù)字組成的)
if(is_numeric(trim($_POST[$i])) && is_numeric(trim($_POST[$j]))){
//查詢數(shù)據(jù)庫中是否存在該ID的商品
$stmt = $pdo->prepare("select?good_id?from?delphi_test_content?WHERE?good_id?=??");
??????$stmt->execute(array($_POST[$i]));
??????$stmt->bindParam(1,$_POST[$i]);
??????$stmt->execute();
??????//返回查詢結(jié)果
??????$count?=?$stmt->rowCount();
??????//如果本地數(shù)據(jù)庫存在該商品ID和庫存記錄，就更新該商品的庫存
??????if($count?!=?0)
??????{
????????$stmt?=?$pdo->prepare("update?delphi_test_content?set?content?=???WHERE?good_id?=??");
????????$stmt->execute(array($_POST[$j],?$_POST[$i]));
????????$stmt->bindParam(1,$_POST[$j]);
????????$stmt->bindParam(2,$_POST[$i]);
????????$stmt->execute();
??????}
??????//如果本地數(shù)據(jù)庫沒有該商品ID和庫存記錄，就新增該條記錄
??????if($count?==?0)
??????{
????????$stmt?=?$pdo->prepare("insert?into?delphi_test_content?(good_id,content)?values?(?,?)");
????????$stmt->bindParam(1,$_POST[$i]);
????????$stmt->bindParam(2,$_POST[$j]);
????????$stmt->execute();
??????}
????}
??}
??$pdo?=?null;
??//關(guān)閉連接
}
?> I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website! Recommended reading:
How to reset an array to a numeric index
How to remove a single value from an array in php
The above is the detailed content of Data security methods to prevent SQL injection in PHP. For more information, please follow other related articles on the PHP Chinese website!
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