Redirect Customer if Minimum order not reached

[Portman]

Thankyou all for your help...

@burt - thanks for the heads up on the startCheckout Hook I will definitly use that instead of what I was trying...

However I am still getting errors...

@Kofod95 when I use your suggestion of;

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Guarantor::ensure_global('Href')::redirect($Linker->build('shopping_cart.php'));

it did not work... it gave me the following error;

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PHP Fatal error:  Uncaught Error: Call to a member function build() on null in .../includes/hooks/shop/checkout/MinOrderRedirect.php:6
Stack trace:
#0 /.../includes/system/versioned/1.0.8.1/hooks.php(160): hook_shop_checkout_MinOrderRedirect->listen_startCheckout(Array)
#1 /.../includes/system/segments/checkout/pipeline.php(14): hooks->generate('startCheckout')
#2 /.../checkout_shipping.php(15): require('/home/devcreat/...')
#3 {main}
  thrown in /.../includes/hooks/shop/checkout/MinOrderRedirect.php on line 6

on the other hand both your extended code;

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$Href = Guarantor::ensure_global('Href');
$Linker = Guarantor::ensure_global('Linker');
$Href::redirect($Linker->build('shopping_cart.php'));

and @ecartz suggestion of;

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Href::redirect(Guarantor::ensure_global('Linker')->build('shopping_cart.php'));

both thew out the following error...

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PHP Warning:  Cannot modify header information - headers already sent by (output started at /.../includes/hooks/shop/checkout/MinOrderRedirect.php:14) in /.../includes/system/versioned/1.0.8.5/href.php on line 195

Are there any other things that I should be trying? at this stage I have stripped the code back to the following for testing purposes...

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<?php
class hook_shop_checkout_MinOrderRedirect {
	
	function listen_startCheckout() {

			$Href = Guarantor::ensure_global('Href');
			$Linker = Guarantor::ensure_global('Linker');
			$Href::redirect($Linker->build('shopping_cart.php'));

		}		
		
	}
	
?>	

[Kofod95]

Use ecartz example.

The error, (the last one about modifying headers) I think, comes from the spaces after your closing ?>

//Daniel

[Portman]

Woo-hoo! it is working, thank you so much everyone!