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How To Add Captcha To Php Form?


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Hi, I really need to add a captcha to this PHP process form?How do I go about doing this?

<?php // Define some constantsdefine( "RECIPIENT_NAME", "John Smith" );define( "RECIPIENT_EMAIL", "john@example.com" );define( "EMAIL_SUBJECT", "Visitor Message" ); // Read the form values$success = false;$senderName = isset( $_POST['senderName'] ) ? preg_replace( "/[^\.\-\' a-zA-Z0-9]/", "", $_POST['senderName'] ) : "";$senderEmail = isset( $_POST['senderEmail'] ) ? preg_replace( "/[^\.\-\_\@a-zA-Z0-9]/", "", $_POST['senderEmail'] ) : "";$message = isset( $_POST['message'] ) ? preg_replace( "/(From:|To:|BCC:|CC:|Subject:|Content-Type:)/", "", $_POST['message'] ) : ""; // If all values exist, send the emailif ( $senderName && $senderEmail && $message ) {  $recipient = RECIPIENT_NAME . " <" . RECIPIENT_EMAIL . ">";  $headers = "From: " . $senderName . " <" . $senderEmail . ">";  $success = mail( $recipient, EMAIL_SUBJECT, $message, $headers );} // Return an appropriate response to the browserif ( isset($_GET["ajax"]) ) {  echo $success ? "success" : "error";} else {?><html>  <head>    <title>Thanks!</title>  </head>  <body>  <?php if ( $success ) echo "<p>Thanks for sending your message! We'll get back to you shortly.</p>" ?>  <?php if ( !$success ) echo "<p>There was a problem sending your message. Please try again.</p>" ?>  <p>Click your browser's Back button to return to the page.</p>  </body></html><?php}?>

?? Thanks in advance!

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