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How to clean data xss attack |
One of the ways that malicious users enter script data is through user inputs on website like name, comments fields.
To avoid code like <SCRIPT></SCRIPT> getting executed it needs to be encoded.
Encode some of the special characters like <,> to <, >. This will prevent script from executing.
Encoding single quote may prevent from SQL injection. To do that encode it before passing it to the SQL.
xss_clean_data.php
<?php
function call_xss_clean_data($char_array)
{
$char_array = str_split($c_text);
$char_array = get_xss_clean_data($char_array);
$c_text = implode('',$char_array);
}
function get_xss_clean_data($char_array)
{
foreach ($char_array as $key => $val)
{
if($val == '<')
{
$char_array[$key] = '<';
}
else if($val == '>')
{
$char_array[$key] = '>';
}
else if($val == '&')
{
$char_array[$key] = '&';
}
else if($val == '"')
{
$char_array[$key] = '"';
}
else if($val == "'")
{
$char_array[$key] = ''';
}
}
return $char_array;
}
?>
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