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copied!<ol> <li>Give a <em>session</em> to the user</li> <li>Define a variable in the session named <em>last-submit</em> and give it the current time as the value.</li> <li>When the form results comes in: <ol> <li>Check what was the <em>last-submit</em> value.</li> <li>If it was more than <em>x</em> seconds ago, then save the <em>time</em> as the <em>last-submit</em> and respond respectively.</li> <li>If it was less than <em>x</em> seconds, reject the form and respond respectively.</li> </ol></li> </ol> <p>If you want to prevent the robots or scripts, then do the following as well:</p> <ol> <li>Add an input field to the form, name it _robo_trap_ and make it invisible to the human-eye by set the style to <code>display: none</code>.</li> <li>When the forms come in check if the <code>robo_trap</code> has any value or if its default value has already changed. If it was, then discard the form because humans can't see and don't need to fill that up.</li> </ol> <p>For example:</p> <pre><code><?php /* User Session */ session_start(); /* Current Time */ $now = new DateTime(); /* First Time ... */ if ( empty($_SESSION['last-submit']) ) { $_SESSION['last-submit'] = $now; } /* On Form Submit ... */ if ( !empty($_POST) ) { /* How fast?! */ $gap = now->diff( $_SESSION['last-submit'] ); $gap = $gap->format('%s'); if ( $gap > 1 ) { // good ... $_SESSION['last-submit'] = $now; } else { // bad ... } } </code></pre> <p>P.S. Just a sample code to give you some ideas, I didn't test it.</p>

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