[SOLVED] Minimum Age verification

JayVee · September 16, 2008

I'm trying to put an alcohol related website together and want to include a minimum age verification script on the site. The code I use is not redirecting properly (I get a blank page with no source code). I've never set a cookie before so I'm not sure where the script is falling down.

Heres what appears before the head content on my page.

<?php

if(isset($_POST['checkage'])) {

$day = ctype_digit($_POST['day']) ? $_POST['day'] : '';

$month = ctype_digit($_POST['month']) ? $_POST['month'] : '';

$year = ctype_digit($_POST['year']) ? $_POST['year'] : '';

$birthstamp = mktime(0, 0, 0, $month, $day, $year);

$diff = time() - $birthstamp;

$age_years = floor($diff / 31556926);

if($age_years >= 18) {

setcookie('legal', 'yes', 0, '/', '.'.$_SERVER['SERVER_NAME']);

# The above line sets a cookie called "legal" throughout the entire domain and its value is yes. The cookie will expire next year, if it is not manually deleted.

$url = '/home.htm';

} else {

setcookie('legal', 'no', 0, '/', '.'.$_SERVER['SERVER_NAME']);

# You're not old enough, come back next year!

$url = '/minor.htm';

}

header('Location: $url');

}

?>

Any help would be appreciated.

Garethp · September 16, 2008

Cookies can be edited, use this instead

$_SESSION['Name'] = "value";

Ofcourse at the top of every page you need

session_start();

but then you can call on the session like any variable. Example:

<?php

$_SESSION['Age'] = 16;

if($_SESSION['Age'] < 18)
{
echo "You are not of age";
exit();
}

?>

Or even

<?php

session_start();

$_SESSION['Text'] = "Anything";
echo $_SESSION['Text'];
?>

The difference is that a user can edit the cookie, because it's stored with them, but they can't edit a session, because it's on the server, and sessions are easier.

JayVee · September 17, 2008

Thanks Garethp I can see how using sessions is easier on the 'follow on' pages but this code still gives me a blank page.

Here is the updated code.

<?php

session_start();

if(isset($_POST['checkage'])) {

$day = ctype_digit($_POST['day']) ? $_POST['day'] : '';

$month = ctype_digit($_POST['month']) ? $_POST['month'] : '';

$year = ctype_digit($_POST['year']) ? $_POST['year'] : '';

$birthstamp = mktime(0, 0, 0, $month, $day, $year);

$diff = time() - $birthstamp;

$age_years = floor($diff / 31556926);

if($age_years >= 18) {

$_SESSION['Age'] = "Yes";

# The above line sets a cookie called "legal" throughout the entire domain and its value is yes. The cookie will expire next year, if it is not manually deleted.

$url = '/home.htm';

} else {

$_SESSION['Age'] = "No";

# You're not old enough, come back next year!

$url = '/minor.htm';

}

header('Location: $url');

}

?>

Any ideas?

JayVee · September 17, 2008

Ok I have narrowed this down a bit. Is it possible that the "if (isset($_POST['checkage']))" statement has a syntax error. If I comment it out the page displays properly. Am I setting the Session variables properly from within an 'if' statement? Any help?

<?php

session_start();

if (isset($_POST['checkage'])) {

$day = $_POST['day'] ? $_POST['day'] : '';

$month = $_POST['month'] ? $_POST['month'] : '';

$year = $_POST['year'] ? $_POST['year'] : '';

$minage = $_POST['country'] ? $_POST['country'] : '';

$birthstamp = mktime(0, 0, 0, $month, $day, $year);

$diff = time() - $birthstamp;

$age_years = floor($diff / 31556926);

if($age_years >= $minage) {

$_SESSION["Age"] = "Yes";

$url = '/home.htm';

} else {

$_SESSION["Age"] = "No";

$url = '/minor.htm';

}

header('Location: $url');

}

?>

Garethp · September 18, 2008

Ok, you have one too many }'s there, and you could try $_SESSION['index'] rather than $_SESSION["index"], but I don't think it'll help. Why have you got $day = $_POST['day'] ? $_POST['day'] : '';? Whats the ? for and the :?

JayVee · September 18, 2008

Can't see where I've got too many }. I want this code to run on submission of form and not as soon as the page is loaded.

Regarding the ? and the : They work like true and false in the statement. They set the values to null if the Post field does not exist. I have removed them but still have the same problem.

waynewex · September 18, 2008

Use this- Gives you the age.

function getAge($YYYYMMDD_In){
	  // Parse Birthday Input Into Local Variables
	  // Assumes Input In Form: YYYYMMDD
	  $yIn=substr($YYYYMMDD_In, 0, 4);
	  $mIn=substr($YYYYMMDD_In, 4, 2);
	  $dIn=substr($YYYYMMDD_In, 6, 2);

	  // Calculate Differences Between Birthday And Now
	  // By Subtracting Birthday From Current Date
	  $ddiff = date("d") - $dIn;
	  $mdiff = date("m") - $mIn;
	  $ydiff = date("Y") - $yIn;

	  // Check If Birthday Month Has Been Reached
	  if ($mdiff < 0) 
	  {
		// Birthday Month Not Reached
		// Subtract 1 Year From Age
		$ydiff--;
	  } elseif ($mdiff==0)
	  {
		// Birthday Month Currently
		// Check If BirthdayDay Passed
		if ($ddiff < 0)
		{
		  //Birthday Not Reached
		  // Subtract 1 Year From Age
		  $ydiff--;
		}
	  }
	  return $ydiff; 
}

Garethp · September 18, 2008

You can't run on Form Submit. PHP is server side an only runs once, when the page loads. The server takes the PHP, does the code and hands the browser the HTML. The browser sees none of the PHP so it can only work on page load.

JayVee · September 18, 2008

Thanks Garethp,

Ok I'm with you there. But if my code is included before my html and its the first time you load the page then the isset statement should be ignored (because no form data was sent). Then, on form submission page reloads and the code recognises that form data was sent and processes the script. Am I way off? My issue is that the if statement I have blocks the loading of the html on the page.

Garethp · September 18, 2008

I'll rewrite your code for you, see if it works, but yes, your spot on

Quite honestly, your code has me stumped. If this doesn't work, try commenting out all lines inside the { and } and see if it works, if so, un-comment each line one at a time to see which one breaks the page.

<?php
if (isset($_POST['checkage'])) 
{
$day = '';
$month = '';
$year = '';
$minage = '';

if(isset($_POST['day']))
	{
	$day = $_POST['day'];
	}

if(isset($_POST['month']))
	{
	$month = $_POST['month'];
	}

if(isset($_POST['year']))
	{
	$year = $_POST['year'];
	}

if(isset($_POST['country']))
	{
	$minage = $_POST['country'];
	} 

$birthstamp = mktime(0, 0, 0, $month, $day, $year);
$diff = time() - $birthstamp;
$age_years = floor($diff / 31556926);

if($age_years >= $minage) 
	{
	$url = '/home.htm';
	} 
else 
	{
	$_SESSION["Age"] = "No";
	$url = '/minor.htm';
	}

header('Location: $url');
}
?>

JayVee · September 18, 2008

Thanks Garethp, the form is finally displaying. I'm going to check and see if I can get the sessions to check on each page in the site and I will paste up the code if it works.

Garethp · September 18, 2008

Ok, in the age verification page, if they are under age add this

$_SESSION['Ofage'] = "No";

and then in a file called check.php

<?php
session_start();
if(isset($_SESSION['Ofage']))
{
if($_SESSION['Ofage'] == "No")
	{
	"You must be of age to view this site";
	exit();
	}
}
?>

and include "check.php" at the top of every page

JayVee · September 19, 2008

Almost there, I just about have this working.

It worked with sessions so I wanted to try and get it working with Cookies so that the user could decide to set up a 'remember me' option and set a cookie with a year long expiry date.

I have the cookies setting properly and the checking script on subsequent pages. I just can't get the $remember variable to add to the time() in the set cookie script.

Here's the code.

if (isset($_POST['checkage'])) 
{
$day = '';
$month = '';
$year = '';
$minage = '';
$remember = 'O';

if(isset($_POST['day']))
	{
	$day = $_POST['day'];
	}

if(isset($_POST['month']))
	{
	$month = $_POST['month'];
	}

if(isset($_POST['year']))
	{
	$year = $_POST['year'];
	}

if(isset($_POST['country']))
	{
	$minage = $_POST['country'];
	}

if(isset($_POST['remember']))
	{
	$remember = 31556926;
	}  

$birthstamp = mktime(0, 0, 0, $month, $day, $year);
$diff = time() - $birthstamp;
$age_years = floor($diff / 31556926);

if($age_years >= $minage) 
	{
	setcookie('legal', 'yes', time() + 31556926);
	$url = '/bntest/home.php';
	} 
else 
	{
	$_SESSION["legal"] = "No";
	setcookie('legal', 'no', time() + 31556926);
	$url = '/bntest/minor.php';
	}

header('Location: '.$url.'');
}

When I try to use

setcookie('legal', 'yes', time() + $remember)

The page fails.

JayVee · September 19, 2008

Ok I have it working now. Huge thanks to Garethp for your time. Here are all the scripts.

Home page php

<?php
/*if the cookie already exists from a previous remember me button click then skip this page*/			
if($_COOKIE['legal'] == "yes")
		{
		header("Location: home.php");	
		}			

if (isset($_POST['checkage'])) 
{
$day = '';
$month = '';
$year = '';
$minage = '';
$remember = 'O';

if(isset($_POST['day']))
	{
	$day = $_POST['day'];
	}

if(isset($_POST['month']))
	{
	$month = $_POST['month'];
	}

if(isset($_POST['year']))
	{
	$year = $_POST['year'];
	}

if(isset($_POST['country']))
	{
	$minage = $_POST['country'];
	}

$rembox=$_POST['remember'];



$birthstamp = mktime(0, 0, 0, $month, $day, $year);
$diff = time() - $birthstamp;
$age_years = floor($diff / 31556926);

if($age_years >= $minage) 
	{
	if($rembox=="yes")
		{
		setcookie('legal', 'yes', time() + 31556926);
		}
		else{
		setcookie('legal', 'yes', 0);

		}
		$url = '/bntest/home.php';
	} 
else 
	{
	setcookie('legal', 'no', 0);
	$url = '/bntest/minor.php';
	}

header('Location: '.$url.'');
}
/*echo "<p>".$_COOKIE["legal"]."</p>";*/	
?>

Home page form (I cut the years back to 1960) and the legal age for most countries is included.

<form id="form1" name="form1" method="post" action="">
                                     <select name="country" id="country">
                                      <option value="99" selected="selected">Choose Country</option>
                                      <option value="18">Ireland</option>
                                      <option value="99">Albania</option>
                                      <option value="18">Antigua</option>
                                      <option value="18">Argentina</option>
                                      <option value="99">Armenia</option>
                                      <option value="18">Australia</option>
                                      <option value="16">Austria</option>
                                      <option value="18">Azerbaijan</option>
                                      <option value="18">Bahamas</option>
                                      <option value="18">Barbados</option>
                                      <option value="18">Belarus</option>
                                      <option value="16">Belgium</option>
                                      <option value="18">Belize</option>
                                      <option value="18">Bermuda</option>
                                      <option value="18">Bolivia</option>
                                      <option value="18">Brazil</option>
                                      <option value="18">Bulgaria</option>
                                      <option value="19">Canada</option>
                                      <option value="18">China</option>
                                      <option value="18">Chile</option>
                                      <option value="18">Columbia</option>
                                      <option value="18">Costa Rica</option>
                                      <option value="18">Croatia</option>
                                      <option value="16">Cuba</option>
                                      <option value="17">Cyprus</option>
                                      <option value="18">Czech Republic</option>
                                      <option value="18">Denmark</option>
                                      <option value="18">Dominican Republic</option>
                                      <option value="18">Ecuador</option>
                                      <option value="21">Egypt</option>
                                      <option value="18">Estonia</option>
                                      <option value="18">Finland</option>
                                      <option value="18">Fiji</option>
                                      <option value="16">France</option>
                                      <option value="18">Georgia</option>
                                      <option value="16">Germany</option>
                                      <option value="17">Greece</option>
                                      <option value="18">Guam</option>
                                      <option value="16">Haiti</option>
                                      <option value="18">Hong Kong</option>
                                      <option value="18">Honduras</option>
                                      <option value="18">Hungary</option>
                                      <option value="20">Iceland</option>
                                      <option value="21">India</option>
                                      <option value="18">Israel</option>
                                      <option value="16">Italy</option>
                                      <option value="18">Jamaica</option>
                                      <option value="20">Japan</option>
                                      <option value="18">Kenya</option>
                                      <option value="18">Liechtenstein</option>
                                      <option value="17">Luxembourg</option>
                                      <option value="19">South Korea</option>
                                      <option value="18">Latvia</option>
                                      <option value="18">Lebanon</option>
                                      <option value="18">Lithuania</option>
                                      <option value="18">Macedonia</option>
                                      <option value="18">Malaysia</option>
                                      <option value="16">Malta</option>
                                      <option value="18">Mexico</option>
                                      <option value="18">Moldova</option>
                                      <option value="18">Morocco</option>
                                      <option value="18">Nepal</option>
                                      <option value="16">Netherlands</option>
                                      <option value="18">New Zealand</option>
                                      <option value="18">Nigeria</option>
                                      <option value="18">Norway</option>
                                      <option value="18">Paraguay</option>
                                      <option value="18">Peru</option>
                                      <option value="18">Philippines</option>
                                      <option value="18">Poland</option>
                                      <option value="16">Portugal</option>
                                      <option value="18">Puerto Rico</option>
                                      <option value="18">Romania</option>
                                      <option value="18">Russia</option>
                                      <option value="18">Serbia</option>
                                      <option value="18">Slovakia</option>
                                      <option value="18">Singapore</option>
                                      <option value="18">South Africa</option>
                                      <option value="18">Spain</option>
                                      <option value="18">Sri Lanka</option>
                                      <option value="18">Sweden</option>
                                      <option value="16">Switzerland</option>
                                      <option value="18">Taiwan</option>
                                      <option value="20">Thailand</option>
                                      <option value="18">Turkey</option>
                                      <option value="18">Uganda</option>
                                      <option value="18">Ukraine</option>
                                      <option value="21">U.A.E.</option>
                                      <option value="18">UK</option>
                                      <option value="21">USA</option>
                                      <option value="18">Venezuela</option>
                                      <option value="18">Other</option>
                                  </select>
                                     <select name="day" id="day">
                                      <option value="1">Day</option>
                                      <option value="1">1</option>
                                      <option value="2">2</option>
                                      <option value="3">3</option>
                                      <option value="4">4</option>
                                      <option value="5">5</option>
                                      <option value="6">6</option>
                                      <option value="7">7</option>
                                      <option value="8">8</option>
                                      <option value="9">9</option>
                                      <option value="10">10</option>
                                      <option value="11">11</option>
                                      <option value="12">12</option>
                                      <option value="13">13</option>
                                      <option value="14">14</option>
                                      <option value="15">15</option>
                                      <option value="16">16</option>
                                      <option value="17">17</option>
                                      <option value="18">18</option>
                                      <option value="19">19</option>
                                      <option value="20">20</option>
                                      <option value="21">21</option>
                                      <option value="22">22</option>
                                      <option value="23">23</option>
                                      <option value="24">24</option>
                                      <option value="25">25</option>
                                      <option value="26">26</option>
                                      <option value="27">27</option>
                                      <option value="28">28</option>
                                      <option value="29">29</option>
                                      <option value="30">30</option>
                                      <option value="31">31</option>
                                    </select>
                                    <select name="month" id="month">
                                      <option value="1" selected="selected">Month</option>
                                      <option value="1">January</option>
                                      <option value="2">February</option>
                                      <option value="3">March</option>
                                      <option value="4">April</option>
                                      <option value="5">May</option>
                                      <option value="6">June</option>
                                      <option value="7">July</option>
                                      <option value="8">August</option>
                                      <option value="9">September</option>
                                      <option value="10">October</option>
                                      <option value="11">November</option>
                                      <option value="12">December</option>
                                    </select>
                                    <select id="year" name="year">
                                      <option selected="selected" value="2008">Year</option>
                                      <option value="1998">1998</option>
                                     <option value="1997">1997</option>
                                      <option value="1996">1996</option>
                                      <option value="1995">1995</option>
                                    <option value="1994">1994</option>
                                     <option value="1993">1993</option>
                                      <option value="1992">1992</option>
                                       <option value="1991">1991</option>
                                      <option value="1990">1990</option>
                                      <option value="1989">1989</option>
                                    <option value="1988">1988</option>
                                      <option value="1987">1987</option>
                                      <option value="1986">1986</option>
                                    <option value="1985">1985</option>
                                      <option value="1984">1984</option>
                                    <option value="1983">1983</option>
                                     <option value="1982">1982</option>
                                      <option value="1981">1981</option>
                                      <option value="1980">1980</option>
                                     <option value="1979">1979</option>
                                      <option value="1978">1978</option>
                                      <option value="1977">1977</option>
                                     <option value="1976">1976</option>
                                      <option value="1975">1975</option>
                                      <option value="1974">1974</option>
                                      <option value="1973">1973</option>
                                      <option value="1972">1972</option>
                                       <option value="1971">1971</option>
                                      <option value="1970">1970</option>
                                      <option value="1969">1969</option>
                                      <option value="1968">1968</option>
                                      <option value="1967">1967</option>
                                      <option value="1966">1966</option>
                                      <option value="1965">1965</option>
                                      <option value="1964">1964</option>
                                       <option value="1963">1963</option>
                                      <option value="1962">1962</option>
                                      <option value="1961">1961</option>
                                      <option value="1960">1960</option>
                                    </select>
                                    <input name="remember" type="checkbox" id="remember" value="yes" />
                                    <input type="image" src="images/entersite.png" height="25" width="191" border="0" alt="Submit Form" name="checkage" value="submit"/>
                    </form>

and here is the include.php code to check on all pages within site

<?php 	
if(!isset($_COOKIE['legal'])) {  	
header("Location: index.php");	 
}

if($_COOKIE['legal'] == "no")
		{
		header("Location: index.php");	
		}			
?>

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[SOLVED] Minimum Age verification

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