Registration form validation help needed

AdRock · August 20, 2007

I found an article here http://www.evolt.org/clever_php_forms that uses form validation

I have made some changes to meet my requirements, even though it's basically an outline but I have come across a few problems I don't know how to fix.

1st problem:

I have 2 fields; 1 to enter a password and the 2nd to match the password. How do i match the passwords and give the errors message etc?

2nd problem:

1 of the fields is for an email address. How do I check the email address and return an error message if not right?

3rd and 4th problem:

I would like to check the database to make sure the username and email address don't already exist in the database.

Here is the code I have so far

Register.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir="ltr" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> 
<title>Form example</title>
<link rel="StyleSheet" href="styles.css" type="text/css">
</head>
<body>
<h1>Easyform Test</h1>
<div id="form">
<?PHP
include_once('easyform.php');
$errorindicator='<img src="alert.gif" width="20" height="20" alt="Alert" title="Indicator for missing form element" border="0" />';
$errorclass="error";
$Javascript=true;
$results=check();
if($results[0]=='Errors:'){
?>
<h2 class="errorhead">There has been an error:</h2>
<p>You forgot to enter the following field(s)</p>
<ul>
<?PHP foreach ($results as $i=>$e){if ($i>0){echo "<li>$e</li>";}}?>
</ul>
<?PHP }else if ($results['Name']!=''){ ?>
<h2 class="thankshead">Thank you for sending your data</h2>
<?PHP exit; }?>	

<form method="post" action="<?=$_SERVER['PHP_SELF']?>">
<input type="hidden" name="required" value="Name,SurName,Email,username,password1,password2,security" />
<fieldset>
	<legend>Your Credentials</legend>
		<label for="your_name">Name:</label>
			<?=add('<input type="text" name="Name" id="Your_First_Name" />')?><br />
		<label for="your_surname">Surname:</label>
			<?=add('<input type="text" name="SurName" id="Your_Surname" />')?> 
		<label for="your_email">Email:</label>
			<?=add('<input type="text" name="Email" id="Your_email_address" />')?>
		<label for="gender">Gender:</label>
			<?=add('<input type="radio" name="Gender" id="Male" checked="checked" value="Male" />')?>
			<label for="Male">Male</label>
			<?=add('<input type="radio" name="Gender" id="Female" value="Female" />')?>
			<label for="Female">Female</label>
</fieldset>
<fieldset>
	<legend>Login Credentials</legend>
		<label for="Your_username">Name:</label>
			<?=add('<input type="text" name="username" id="Username" />')?><br />
		<label for="your_password1">Enter password:</label>
			<?=add('<input type="password" name="password1" id="Password" />')?> 
		<label for="your_password2">Confirm password:</label>
			<?=add('<input type="password" name="password2" id="Confirm_password" />')?>	
</fieldset>
<fieldset>
	<legend>Anti-Spam key</legend>
		<label for="anti-spam">Anti-spam key:</label>
			<?=add('<input type="text" name="security" id="Anti-Spam_key" />')?><br />	
</fieldset>
<p align="right"><input type="submit" value="Send" /></p>
</form>
</div>
</body>
</html>

Here is the functions in easyform.php

<?PHP
/*
Easyform developer edition 
version 1.0 01.05.2003
written by Chris Heilmann
more info: http://www.onlinetools.org/articles/easyform/
*/
function check(){
if ($_POST!=''){
	$sentarray=array();
	$tocheck=explode(',',$_POST['required']);
	$error[0]="Errors:";
	foreach ($tocheck as $t){if(!array_key_exists($t,$_POST)){$error[]=$t;}}
	foreach (array_keys($_POST) as $p){
		if(!preg_match('/initvalue/',$p) and !preg_match('/required/',$p)){
			$sentarray[$p]=$_POST[$p]==$_POST[$p.'initvalue']?'':$_POST[$p];
		}
		foreach ($tocheck as $c){
			if ($p==$c and $sentarray[$p]==''){
				$error[]=$_POST[$p.'initvalue'];
			}
		}
	}
	return $error[1]==''?$sentarray:$error;	
	}
}

function add($f){
global $errorindicator,$errorclass,$Javascript;
$tocheck=explode(',',','.$_POST['required']);
preg_match('/id="(.*?)"/i',$f,$i);
preg_match('/name="(.*?)"/i',$f,$n);
preg_match('/type="(.*?)"/i',$f,$t);
preg_match('/value="(.*?)"/i',$f,$iv);
$n=$n[1];$iv=$iv[1];$i=str_replace('_',' ',$i[1]);
if(preg_match('/<textarea/',$f)){
	$v=$_POST[$n]==''?$i:$_POST[$n];
	$f=preg_replace('/<textarea(.*?)>(.*?)<\/textarea>/',
	'<textarea\\1>'.stripslashes(htmlentities($v)).'</textarea>',$f);
			if($Javascript){$f=preg_replace('/<textarea/','<textarea  onfocus="this.value=this.value==\''.$i.'\'?\'\':this.value"',$f);}
}	
if(preg_match('/<select/',$f)){
	preg_match('/<select.*?>/',$f,$st);
	preg_match_all('/<option value="(.*?)">(.*?)<\/option>/',$f,$allopt);
	foreach ($allopt[0] as $k=>$a){
		if($_POST[$n]==$allopt[1][$k] || ($_POST[$n]=='' && $k==0)){
			$preg='/<option value="';
			$preg.=$allopt[1][$k].'">'.$allopt[2][$k].'<\/option>/si';
			$rep='<option selected="selected" value="';
			$rep.=$allopt[1][$k].'">'.$allopt[2][$k].'</option>';
			$f=preg_replace($preg,$rep,$f);
		}
	}
}else{
	switch ($t[1]){
		case 'text':
			$v=$_POST[$n]==''?'value="'.$i.'"':'value="'.stripslashes(htmlentities($_POST[$n])).'"';
			$f=preg_replace('/<input/','<input '.$v,$f);
			if($Javascript){$f=preg_replace('/<input/','<input onfocus="this.value=this.value==\''.$i.'\'?\'\':this.value"',$f);}
		break;
		case 'checkbox':
			$v=$_POST[$n]=='on'?' checked="checked"':'';
			$f=preg_replace('/<input/','<input'.$v,$f);
		break;
		case 'radio':
			$f=$_POST[$n]==''?$f:preg_replace('/checked.*?\s/','',$f); 
			$v=$_POST[$n]==$iv?' checked="checked"':'';
			$f=preg_replace('/<input/','<input'.$v,$f);
		break;
	}
}
$f.='<input type="hidden" name="'.$n.'initvalue" value="'.$i.'" />';
if (array_search($n,$tocheck) and ($_POST[$n]=='' or $_POST[$n]==$i)){
		if($errorindicator!=''){$f=$errorindicator.$f;}
		if($errorclass!=''){$f=preg_replace('/name=/i','class="'.$errorclass.'" name=',$f);}
}
return $f;
}
?>

This is the code I use to check the email address whcih I use on my current page but i want to itegrate it into the new form

{
	$email = trim($email);
	$_name = "/^[-!#$%&\'*+\\.\/0-9=?A-Z^_`{|}~]+";
	$_host = "([-0-9A-Z]+\.)+";
	$_tlds = "([0-9A-Z]){2,4}$/i";

	if( !preg_match($_name."@".$_host.$_tlds,$email))
	{
		$errmsg.="Email address has incorrect format!<br />";
		$valid=false;
	}
}

and here is how i compare passwords, check username, email address and if the captcha image matches what's entered in the text field

if( mysql_num_rows(mysql_query("SELECT username FROM users WHERE username = '$username'")) )
{
	$errmsg."The username you have selected has already been used by another member in our database. Please choose a different Username!<br />";
	$valid=false;
}					

if( mysql_num_rows(mysql_query("SELECT email_address FROM users WHERE email_address = '$email_address'")) )
{
	$errmsg.="Your email address has already been used by another member in our database. Please submit a different Email address!!<br />";
	$valid=false;
}

if ( strlen($password1) < 3 ){
	$errmsg.="Password must be more than 3 characters in legth<br />";
	$valid=false;
}					

if (strcmp( $password1,$password2 ) !=0){
	$errmsg.="Both passwords do not match<br />";
	$valid=false;
}

if (empty($_POST['verify']) && $_POST['verify'] == $_SESSION['captchstr'])
{
    $errmsg.="Please enter Anti-Spam key:<br />";
    $valid=false;
}

If anyone can help on any of this it would be a great improvement

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Registration form validation help needed

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