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1).Base64 Encode and Decode String in PHP

function base64url_encode($plainText) {
        $base64 = base64_encode($plainText);
        $base64url = strtr($base64, '+/=', '-_,');
        return $base64url;
}

function base64url_decode($plainText) {
        $base64url = strtr($plainText, '-_,', '+/=');
        $base64 = base64_decode($base64url);
        return $base64;
} 

2).Generate An Authentication Code in PHP

 

3).Date format validation in PHP

function checkDateFormat($date)
{
        //match the format of the date
        if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))
        {
                //check weather the date is valid of not
                if(checkdate($parts[2],$parts[3],$parts[1]))
                        return true;
                else
                return false;
        }
        else
                return false;
}

4).HTTP Redirection in PHP



5).Unzip a Zip File


//Use the code as following:

In order to guard your phpBB forum from redundant letters,you can use the below simple 
function called Flaf_Spam ,
which is devoted to fighting spam.
To use Flat_Spam mode, you should download posting.php file from your forum's directory, 
and simply paste the below
code at line number nearer to 1020.

//avoid posting span words in reviews
function flag_spam($text) {
// Check for common spam words
$words = array(
'xxx',
'http',
'www',
'url',
'.com',
'.net',
'.org');

foreach ($words as $word) {
preg_match("/$word/i", $text, $matches);
if(count($matches) > 0)
{
$total_matches = 1;
}
}
return $total_matches;
}
$total_matches_spam = flag_spam($message_parser->message);

replace



With

//badwords

if($total_matches_spam!="1")
{
unset($message_parser);
$redirect_url = submit_post($mode, $post_data['post_subject'], $post_data['username'], 
$post_data['topic_type'], $poll, $data, $update_message);
}
else {
$url = "Location:http://yoursitename.com/";
meta_refresh(3, $url);
$message .= '

' . sprintf($user->lang['RETURN_FORUM'], '
}
That is it
This function perform the necessary checks which determine whether a certain message is spam or not.