Easy-to-understand PHP anti-injection code_PHP tutorial-PHP Tutorial-php.cn

Easy-to-understand PHP anti-injection code_PHP tutorial

WBOY

Release： 2016-07-21 15:39:23

Original

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Let’s introduce two methods. First, please save the following code as safe.php in the root directory of the website, and then add include(“/safe.php“); in front of each php file:

php anti-injection code method one:

Copy code The code is as follows:

 
//Illegal characters to be filtered
$ArrFiltrate=array(”'”,”;”,”union”); 
//The url to be redirected after an error occurs, if not filled in, the previous page will be defaulted 
$StrGoUrl=””; 
//Whether there is a value in the array
function FunStringExist($StrFiltrate,$ArrFiltrate){ 
foreach ($ArrFiltrate as $key=>$value){ 
if (eregi($value,$StrFiltrate)){ 
return true; 
} 
} 
return false; 
} 
//Merge $_POST and $_GET 
if(function_exists(array_merge)){ 
$ArrPostAndGet=array_merge($HTTP_POST_VARS,$HTTP_GET_VARS); 
}else{ 
foreach($HTTP_POST_VARS as $key=>$value){ 
$ArrPostAndGet[]=$value; 
} 
foreach($HTTP_GET_VARS as $key=>$value){ 
$ArrPostAndGet[]=$value; 
} 
} 
//Verification starts
foreach($ArrPostAndGet as $key=>$value){ 
if (FunStringExist($value,$ArrFiltrate)){ 
echo “"; 
if (emptyempty($StrGoUrl)){ 
echo "”; 
}else{ 
echo “ "; 
} 
exit; 
} 
} 
?> 

php anti-injection code method two:

Copy code The code is as follows:

 
/* Filter all GET variables*/ 
foreach ($_GET as $get_key=> ;$get_var) 
{ 
if (is_numeric($get_var)) { 
$get[strtolower($get_key)] = get_int($get_var); 
} else { 
$get [strtolower($get_key)] = get_str($get_var); 
} 
} 
/* Filter all POST variables*/ 
foreach ($_POST as $post_key=>$post_var ) 
{ 
if (is_numeric($post_var)) { 
$post[strtolower($post_key)] = get_int($post_var); 
} else { 
$post[strtolower( $post_key)] = get_str($post_var); 
} 
} 
/* Filter function*/ 
//Integer filter function 
function get_int($number) 
{ 
return intval($number); 
} 
//String filter function 
function get_str($string) 
{ 
if (!get_magic_quotes_gpc()) { 
return addslashes($string); 
} 
return $string; 
} 