php HtmlReplace input filtering security function_PHP tutorial

Copy code The code is as follows:

// $rptype = 0 means only replace html tags
// $rptype = 1 means Replace html tags while removing consecutive whitespace characters
// $rptype = 2 means replace html tags while removing all whitespace characters
// $rptype = -1 means only replace html dangerous tags
function HtmlReplace($ str,$rptype=0)
{
$str = stripslashes($str);
if($rptype==0)
{
$str = htmlspecialchars($str);
}
else if($rptype==1)
{
$str = htmlspecialchars($str);
$str = str_replace(" ",' ',$str);
$str = ereg_replace("[rnt ]{1,}",' ',$str);
}
else if($rptype==2)
{
$str = htmlspecialchars($str);
$str = str_replace(" ",'',$str);
$str = ereg_replace("[rnt ]",'',$str);
}
else
{
$str = ereg_replace("[rnt ]{1,}",' ',$str);
$str = eregi_replace('script','ｓcｽriｐptｽ',$ str);
$str = eregi_replace("<[/]{0,1}(link|meta|ifr|fra)[^>]*>",'',$str);
}
return addslashes($str);
}

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