PHP Posts and Redirects
Now we’re going to add in some functionality to your php. We’ll make a form which checks a person’s age then either redirects them to a different page, or displays an error message.
- First off is some html code for a form, the form will send via post method one variable for age.
<form method=”post”>Age <input name=”age” type=”text” id=”age”></form>
- So now you’ve got a basic form that has a field for age. Now lets put in some a php code area and get started <?php ?>
- Now we need to put a variable there to catch whatever is posted back to the document. You can assign a vairable to a post like in the example.
<?php
/*$_POST is the method for describing a posted variable, then you describe the id of
the variable within the [' '] tags.*/
$age=$_POST['age'];
echo "Age: $age";
?>
This should print out Age: if you just start the page, and if you submit an age it will say Age: [your age here].
- Now lets add in a simple if statement determining if the age is below a certain point, if it is say below 13 we’ll assign a variable $error a sentence detailing how this site is made for those 13 or above.
<?php
$age=$_POST['age'];
if ($age<13) {$error="Sorry this site is only for those aged 13 or above."}
/* just having the variable in an if statement's ()s checks to see if the
variable has been assigned anything or not. If it has it will run the statement.*/
if ($error) {echo $error;}
?>
Depending on what you submit to the page this will either print nothing or it will print Sorry this site is only for those aged 13 or above.
- Lets add in an else statement so that if they are able to see the site it will tell them that the site is redirecting them there now.
<?php
$age=$_POST['age'];
if ($age<13) {$error="Sorry this site is only for those aged 13 or above."}
if ($error) {echo $error;}
else { echo "Your old enough to view the site, redirecting you now.";}
?>
This will either tell the person they’re too young or tell them they’re old enough and the site is redirecting.
- The final part of the script is actually redirecting a person if they are of the correct age. So add in the following code to the redirect. header(’Location: http://www.example.com/’);
<?php
$age=$_POST['age'];
if ($age<13) {$error="Sorry this site is only for those aged 13 or above."}
if ($error) {echo $error;}
else { echo "Your old enough to view the site, redirecting you now.";
//remember you would be changing example.com below to whatever url you need.
header('Location: http://www.example.com/');}
?>
This will either tell you that your not old enough or redirect you to http://www.example.com, This lesson is now over.
