php pass single product to cart with hidden field - php

Question

I am trying to redirect a form to a shopping cart with one product in it at the same price. There is a redirect in place that if the cart it empty it goes to another page an I would like that to not happen. Here is the form code:
<form method="post" onSubmit="return varifyForm()">
<?php
if( $this->session->flashdata('error_msg') != ''){
?>
<p style="font-weight:bold; color:#F00;"><?php echo $this->session->flashdata('error_msg'); ?></p>
<?php
}
?>
<?php
if( $this->session->flashdata('success_msg') != ''){
?>
<p style="font-weight:bold; color:#0F0;"><?php echo $this->session->flashdata('success_msg'); ?></p>
<?php
}
?>
<div class="form-group">
<label><strong>Name*</strong></label>
<div class="row">
<div class="col-sm-6">
<input type="text" class="form-control" placeholder="First" style="margin-bottom:5px;" id="" name="terms[first_name]" value="" required>
</div>
<div class="col-sm-6">
<input type="text" class="form-control" placeholder="Last" style="margin-bottom:5px;" id="" name="terms[last_name]" value="" required>
</div>
</div>
</div>
<div class="form-group">
<label><strong>Password*</strong></label>
<div class="row">
<div class="col-sm-6">
<input type="password" class="form-control" id="" name="password" value="" placeholder="Enter Password" style="margin-bottom:5px;" required>
</div>
<div class="col-sm-6">
<input type="password" class="form-control" placeholder="Confirm Password" id="" name="confirm_password" value="" style="margin-bottom:5px;" required>
</div>
</div>
</div>
<div class="form-group">
<label><strong>Email*</strong></label>
<input type="email" class="form-control" id="" name="terms[email]" value="" placeholder="Email" required>
</div>
<div class="form-group">
<label for="sel1"><strong>User Role*</strong></label>
<select class="form-control" id="user_role" name="terms[user_role]">
<option value="Member">Member</option>
</select>
</div>
<div class="form-group">
<label for="sel1"><strong>Your Cause*</strong></label>
<select class="form-control" id="cause" name="terms[cause]">
<option value="<?php echo $causes['user_id']; ?>"><?php _e($causes['nonprofit_name']); ?></option>
</select>
</div>
<div class="form-group">
<label><strong>Zip Code*</strong></label>
<input type="text" class="form-control" id="" name="terms[zip]" value="" required>
</div>
<div class="form-group">
<label><strong>Terms and Conditions*</strong></label>
<div class="checkbox-inline full">
<input type="checkbox" id="terms">
<strong>I agree to the</strong> <strong>Terms and Conditions</strong>
</div>
</div><br>
<button type="submit" name="btnSignUp" value="signup" class="btn btn-primary"><p style="margin:0;">NEXT</p></button>
</form>
I have been stuck fixing someone else's work and appreciate any help that can be given. Let me know if any other information is needed.
Thank you!

Answer 1

Hi as you mentioned the below sample code may helpful to you. If you require additional help please tell me.
if(!empty($_POST['cart'])){//what ever the cart item name please replace with it.
$cart["{item_id}"] = ["quantity"=>"{qty}","price"=>"{fixed _price}"];
$_SESSION['cart']=$cart;
header('Location: redirect.php'); //replace with your actual redirect page to redirect.php
}else{
header('Location: redirect_other.php'); //replace with your actual other redirect page to redirect_other.php
}