Custom text for 'woocommerce_product_add_to_cart_text' filter for all product types/ cases.

wc-custom-add-to-cart-texts.php

<?php

/** Do NOT include the opening php tag */


add_filter( 'woocommerce_product_add_to_cart_text' , 'custom_woocommerce_product_add_to_cart_text' );
/**
* Custom text for 'woocommerce_product_add_to_cart_text' filter for all product types/ cases.
*
* @link   https://gist.github.com/deckerweb/cf466e017fd01d503469
*
* @global $product
*
* @return string String for add to cart text.
*/
function custom_woocommerce_product_add_to_cart_text() {

	global $product;

	$product_type = $product->product_type;

	switch ( $product_type ) {

		case 'external':
			return __( 'Buy product', 'woocommerce' );

		break;
		case 'grouped':
			return __( 'View products', 'woocommerce' );

		break;
		case 'simple':
			return __( 'Add to cart', 'woocommerce' );

		break;
		case 'variable':
			return __( 'Select options', 'woocommerce' );

		break;
		default:
			return __( 'Read more', 'woocommerce' );

	}  // end switch

}  // end function

Just as @luboslives commented (thank You) - it doesn't seem depricated to me. It can be found here: https://woocommerce.github.io/code-reference/files/woocommerce-includes-class-wc-product-external.html#source-view.181 , generated "on August 17th, 2021 at 07:59 pm.".

Also, there is no need to use global $product variable. The function can take two parameters: $text and $product. So if one would like to only change text for - let's say - 'simple' products the following simpler code may be used.

function woocommerce_add_to_cart_button_text ( $text, $product ) {
    if ( $product->product_type == 'simple' ) {
        return 'Add to Cart';
    }
    return $text;
}
add_filter( 'woocommerce_product_add_to_cart_text' , 'woocommerce_add_to_cart_text' );

Thank You for the gist @deckerweb!

This can cause some notices -- product_type was called incorrectly. Product properties should not be accessed directly. -- it's likely better to try ->get_type() instead of ->product_type directly --

https://github.com/woocommerce/woocommerce/blob/fd8a5604ba9a0c2792556bc76e9ca5207cd551e1/plugins/woocommerce/includes/legacy/abstract-wc-legacy-product.php#L72

It can cause a wc_doing_it_wrong()

It should be used like this, otherwise will give error. (Specify number of arguments accepted)
.

function woocommerce_add_to_cart_button_text ( $text, $product ) {
    if ( $product->product_type == 'simple' ) {
        return 'Add to Cart';
    }
    return $text;
}
add_filter( 'woocommerce_product_add_to_cart_text' , 'woocommerce_add_to_cart_text' , 10 , 2); // Specify number of arguments accepted.