source: trunk/xgraph/jpgraph/Examples/antispamex01.php

<?php // content="text/plain; charset=utf-8"
// Antispam example using a random string
require_once "jpgraph/jpgraph_antispam.php";

// Create new anti-spam challenge creator
// Note: Neither '0' (digit) or 'O' (letter) can be used to avoid confusion
$spam = new AntiSpam();

// Create a random 5 char challenge and return the string generated
$chars = $spam->Rand(5);

// Stroke random cahllenge
if( $spam->Stroke() === false ) {
    die('Illegal or no data to plot');
}

?>