Web2 style secure & flexible free php contact form with easy setup

This a small and powerful contact form, which protected with a random colored captcha. You can start to use it with changing just ADMIN_EMAIL. You can easily add-remove contact fields like name, email, homepage, phone number, fax, address, subject, message etc. You can easily set required fields, which visitors must fill. Required fields are red marked when visitors try to send form with empty values. It is flexible; you can change filename or include it in your cms modules. Because of more security it uses session for validation not cookies. There is also a small brute-force protection included. A small donation or backlink wished but not required. Demo in action! (Download link is below)

Code of PHP-File:

<?php

/**
*	powered by @cafewebmaster.com
*	free for private use
*	please donate by paypal or give a backlink
*/



// Configuration
define("ADMIN_MAIL", "your_email@example.com");
define("MAIL_SUBJECT", "Message over Contact-Form from Your Website");

// one line input fields like name, phone, fax, website etc, just add or remove what do you want
$contact_fields_input = array("Name", "Website", "E-Mail", "Phone_Number", "Subject"); // no spaces, no symbols

// multiline input field(s), just add or remove what do you want
$contact_fields_textarea = array("Message");

// required fields, visitor must fill to send form
$contact_fields_required = array("Name", "Website", "E-Mail", "Phone_Number", "Message");




// You dont need to change below
###############################################################################

foreach($_GET as $k=>$v){
	$req_string .= "".$k."=".$v."&";
}
$selfurl = 'http://'.$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$req_string ;


session_start();


function playCaptcha(){

	$text = rand(999,9999); // 4 chars number
	$seckey = md5(strtolower($text));
	$_SESSION["seckey"] = $seckey;
	
	$img_w = 80;
	$img_h = 30;
	$left = 5;
	$top = 2;
	$font = 'verdana.ttf';
	$font_size = 6;
	$sleep = 1; // against  brute-force
	
	
	
	
	
	
	$imgd = imagecreate($img_w, $img_h);
	
	$bg_light = imagecolorallocate($imgd, rand(200,255), rand(200,255), rand(200,255));
	$red = imagecolorallocate($imgd, 255, 0, 0);
	
	imagefill($imgd, 0, 0, $bg_light);
	
		
	$polight = imagecolorallocate($imgd, rand(155,240), rand(155,240), rand(155,240));
	$points = array( rand(0,$img_w), rand(0,$img_h),  rand(0,$img_w), rand(0,$img_h),
                     rand(0,$img_w), rand(0,$img_h),  rand(0,$img_w), rand(0,$img_h),  rand(0,$img_w), rand(0,$img_h));
	imagefilledpolygon($imgd, $points, 5, $polight);
	
	
	
	while($i2<10){ $i2++;
		$clight = imagecolorallocate($imgd, rand(155,240), rand(155,240), rand(155,240));
		$r1 = rand(0,$img_w);   $r2 = rand(0,$img_h);   $r3 = rand(0,$img_w);   $r4 = rand(0,$img_h);
		imageline ( $imgd, $r1, $r2, $r3, $r4,  $clight);
	#   imageline ( $imgd, $r1+1, $r2, $r3+1, $r4,  $clight);
	}
	
	
	while( $i < strlen($text) ){ $i++;
		$darkcolor = imagecolorallocate($imgd, rand(0,111), rand(0,222), rand(0,222));
		$current_letter = substr($text, $i-1, 1);
	
		$font2 = $font;
	#       if( is_numeric($current_letter) ){ $darkcolor = $red ; $font2 = 'times.ttf'; }
	#       imagettftext($imgd, $font_size, rand(-45,45), $left+($i*30), $top+rand(25,30), $darkcolor, $font2, $current_letter);
	
      imagestring($imgd, $font_size, $left+(($i-1)*20), $top+rand(1,5), $current_letter, $darkcolor);
	}
	
	sleep($sleep);
	
	header("Pragma: no-cache");
	header("Content-type: image/jpg");
	ImageJPEG( $imgd );
	imagedestroy($imgd);
	
	exit;

} // end of playCaptcha









function displayContactForm(){
	
	global $selfurl, $contact_fields_input, $contact_fields_textarea, $contact_fields_required ;
	
	foreach($contact_fields_input as $v){ 
		$redmark = ($_POST && in_array($v, $contact_fields_required) && !$_POST[$v]) ? "redmark" : "" ;
		if($redmark) $error_req++;
		$required = in_array($v, $contact_fields_required) ? "*" : "" ;
		$htmo_form .= "<p><label for=\"$v\">$v $required :</label>
		<input name=\"$v\" size=\"60\" value=\"".$_POST[$v]."\" class=\"contactFields $redmark\" /></p>"; 
		}
	
	foreach($contact_fields_textarea as $v)	{ 
		$redmark = ($_POST && in_array($v, $contact_fields_required) && !$_POST[$v]) ? "redmark" : "" ;
		if($redmark) $error_req++;
		$required = in_array($v, $contact_fields_required) ? "*" : "" ;
		$htmo_form .= "<p><label for=\"$v\">$v $required :</label>
		<textarea name=\"$v\" cols=\"60\" rows=\"20\" class=\"contactFields $redmark\">$_POST[$v]</textarea></p>";
		}
	
		$redmark = ($_POST && $_SESSION["seckey"] != md5($_POST['captcha'])) ? "redmark" : "" ;
		if($redmark) $error_req++;
		$htmo_form .= "<p><label for=\"captcha\">Captcha:</label> 
			<img src=\"".$selfurl."yekta=captcha\" height=\"30\" width=\"80\" align=\"absmiddle\"> 
			&#187;&#187;
			<input name=\"captcha\" class=\"captcha $redmark\" /> 
			<input type=\"submit\"  class=\"submit\" /></p>";
	
		
		if($_POST && !$error_req){	
			foreach($_POST as $k=>$v){
				if($k == "captcha") continue;
				$mailbody .= "$k : \n$v\n\n";
			}
		
			if(@mail(ADMIN_MAIL, MAIL_SUBJECT, $mailbody, "From: ".ADMIN_MAIL."\r\n")) {
				$htmo_form = "<p>Your eMail has been sent. Thank you!</p>";
			} else {
				$htmo_form = "<p class=\"redmark\">Error: Mail could not been sent!</p>";
			}
		}

		
echo <<<cafewebmaster_com
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
	<head>
		<style type="text/css">
			#cform { margin: auto; width: 460px; background-color: #eee; padding: 10px; font: bold 12px verdana; }
			#cform img { border: 1px solid #000; }
			#cform .redmark { border: 2px solid #f00; }
			#cform h1 { background-color: #036; padding: 5px; margin: 0; color: #abc; }
			#cform p { background-color: #ddd; padding: 5px ; }
			#cform label { display: block; float: left; width: 140px; clear: left; }
			#cform input.contactFields { width: 300px; }
			#cform input.submit { width: 120px; }
			#cform input.captcha { width: 40px; }
			#cform textarea.contactFields { width: 300px; height: 12em; }
		</style>
	</head>
	<body>

	<div id="cform">
		<h1>Contact us!</h1>
		<form method="post" action="$selfurl">$htmo_form</form>
		<div style="text-align: right; font: 9px verdana;">Powered by <a href="http://www.cafewebmaster.com" title="Wemaster resources">CafeWebmaster</a></div>
	</div>

	</body></html>
cafewebmaster_com;

}




switch($_GET['yekta']){
	case "captcha": 
		playcaptcha(); 
		break;
		
	default: displayContactForm();
}