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Check referer

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Check referer Empty Check referer

Post by Sfinx Thu Nov 29, 2012 10:47 am

Code:
<!-- This Script is from www.freecodescript.com, Coded by: Krishna Eydatoula, Mahmood Bina-->


function is_ipv4($s)
\{
    $n = '(\[0-9]|1?\d\d|2\[0-4]\d|25\[0-5])';
    return preg_match('#^\{$n\}\.\{$n\}\.\{$n\}\.\{$n\}$#', $s);
\}
function check_referer($db_referer = './referer.txt')
\{
    if ( !preg_match('#http://(.*?)/(.*)#', $_SERVER\['HTTP_REFERER'], $m) )
    \{
        return false;
    \}
    if ( !is_ipv4($m\[1]) && is_numeric(strpos($m\[1], '.')) && substr_count($m\[1], '.') > 1 )
    \{
        $m\[1] = strrev($m\[1]);
        $m\[1] = substr($m\[1], 0, strpos($m\[1], '.', strpos($m\[1], '.') + 1));
        $m\[1] = strrev($m\[1]);
    \}
    if ( $m\[1] == $_SERVER\['HTTP_HOST'] )
    \{
        return false;
    \}
    if ( file_exists($db_referer) )
    \{
        $referer = unserialize(file_get_contents($db_referer));
    \}
    else
    \{
        $referer = array();
    \}
    if ( !isset($referer\[$m\[1]]) )
    \{
        $referer\[$m\[1]] = 0;
    \}
    $referer\[$m\[1]]++;
    file_put_contents($db_referer, serialize($referer));
    return true;
\}

<br><font face='Tahoma'><a target='_blank' href='http://www.freecodescript.com/'><span style='font-size: 8pt; text-decoration: none'>Free Code Script</span></a></font>

      
Sfinx
Sfinx
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