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Prevent Duplicate Cart Items

Prevents the same item from being added to the cart multiple times.

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php


	`<?php`
	`function pw_edd_prevent_duplicate_cart_items( $download_id, $options ) {`
	`if( edd_item_in_cart( $download_id, $options ) ) {`
	`if( edd_is_ajax_enabled() && defined('DOING_AJAX') && DOING_AJAX ) {`
	`die('1');`
	`} else {`
	`wp_redirect( edd_get_checkout_uri() ); exit;`
	`}`
	`}`
	`}`
	`add_action( 'edd_pre_add_to_cart', 'pw_edd_prevent_duplicate_cart_items', 10, 2 );`

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