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here are some of the best and useful php scripts and snippets to help in your projects. Php displayed below. Use the search for specific script lookups. Click the category links to view scripts in Javascript and cgi. To add your own script click the link and add your useful script example.
encode decode validate get post array values with salt
anti injection validate user input get encode get decode
<?php
//many ways to do this just another example
//include this in the top of your page
//encode with salt validate
$redirect='http://spamhaus.org';//send hacker to
$ipfile="ipBan.data";//ip file
$ip = $_SERVER['REMOTE_ADDR'];
//check ip ban file before anything
$f = fopen($ipfile . '.lock', 'w');
flock($f, LOCK_SH);
$lines = file($ipfile);
flock($f, LOCK_UN);
fclose($f);
unlink($file . '.lock');
foreach ($lines as $line) {
$parts = explode('.', $ip);
//adjust to check each part of ip
//set nowfor checking first 3 parts
// $check2 = $parts[0] . '.' . $parts[1];
$check3 = $parts[0] . '.' . $parts[1] . '.' . $parts[2];
// $check4 = $parts[0] . '.' . $parts[1] . '.' . $parts[2] . '.' . $parts[3];
if (strstr($line,$check3)) {
echo "I told you have been banned.";
//echo("<meta http-equiv=\"Refresh\" content=\"2;URL=$redirect\">");
exit();
}
}
if(!isset($_SESSION['Cksum'])){
makeCksum();
}
function makeCksum(){
$str = "";
for ($i=0;$i<32;++$i)
$str .= chr(rand(32,126));
$_SESSION['Cksum'] = $str;
}
//encode your get with saved to session salt
//example get link
echo "<a href=\"?action=".encode($x)."\">link</a>";
function encode($x) {
return strtr(base64_encode(substr($_SESSION['Cksum'],rand(0,28),4) . $x), '+/=', '-_~');
}
//decode get and validate
function decode($x) {
$y = base64_decode(strtr($x, '-_~', '+/='));
if (strpos($_SESSION['Cksum'],substr($y,0,4)) === false) return false;
return substr($y,4-strlen($y));
}
if(!decode($x)) {//if salt not decoded ban ip
$fp = fopen($ipfile, "a");
$canWrite = false;
while (!$canWrite) {
$canWrite = flock($fp, LOCK_EX);
}
fwrite($fp, "$ip\n");
fclose($fp);
echo "Success you have been banned.";
echo("<meta http-equiv=\"Refresh\" content=\"0;URL=$redirect\">");
exit();
}
?>