Remove "or checkout with PayPal" (shown as button) on CART page for WooCommerce PayPal Express Checkout Payment Gateway

functions.php

<?php

/**
 * Remove Class Filter Without Access to Class Object
 *
 * In order to use the core WordPress remove_filter() on a filter added with the callback
 * to a class, you either have to have access to that class object, or it has to be a call
 * to a static method.  This method allows you to remove filters with a callback to a class
 * you don't have access to.
 *
 * Works with WordPress 1.2+ (4.7+ support added 9-19-2016)
 * Updated 2-27-2017 to use internal WordPress removal for 4.7+ (to prevent PHP warnings output)
 *
 * @param string $tag         Filter to remove
 * @param string $class_name  Class name for the filter's callback
 * @param string $method_name Method name for the filter's callback
 * @param int    $priority    Priority of the filter (default 10)
 *
 * @return bool Whether the function is removed.
 */
function remove_class_filter( $tag, $class_name = '', $method_name = '', $priority = 10 ) {
	global $wp_filter;

	// Check that filter actually exists first
	if ( ! isset( $wp_filter[ $tag ] ) ) return FALSE;

	/**
	 * If filter config is an object, means we're using WordPress 4.7+ and the config is no longer
	 * a simple array, rather it is an object that implements the ArrayAccess interface.
	 *
	 * To be backwards compatible, we set $callbacks equal to the correct array as a reference (so $wp_filter is updated)
	 *
	 * @see https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
	 */
	if ( is_object( $wp_filter[ $tag ] ) && isset( $wp_filter[ $tag ]->callbacks ) ) {
		// Create $fob object from filter tag, to use below
		$fob = $wp_filter[ $tag ];
		$callbacks = &$wp_filter[ $tag ]->callbacks;
	} else {
		$callbacks = &$wp_filter[ $tag ];
	}

	// Exit if there aren't any callbacks for specified priority
	if ( ! isset( $callbacks[ $priority ] ) || empty( $callbacks[ $priority ] ) ) return FALSE;

	// Loop through each filter for the specified priority, looking for our class & method
	foreach( (array) $callbacks[ $priority ] as $filter_id => $filter ) {

		// Filter should always be an array - array( $this, 'method' ), if not goto next
		if ( ! isset( $filter[ 'function' ] ) || ! is_array( $filter[ 'function' ] ) ) continue;

		// If first value in array is not an object, it can't be a class
		if ( ! is_object( $filter[ 'function' ][ 0 ] ) ) continue;

		// Method doesn't match the one we're looking for, goto next
		if ( $filter[ 'function' ][ 1 ] !== $method_name ) continue;

		// Method matched, now let's check the Class
		if ( get_class( $filter[ 'function' ][ 0 ] ) === $class_name ) {

			// WordPress 4.7+ use core remove_filter() since we found the class object
			if( isset( $fob ) ){
				// Handles removing filter, reseting callback priority keys mid-iteration, etc.
				$fob->remove_filter( $tag, $filter['function'], $priority );

			} else {
				// Use legacy removal process (pre 4.7)
				unset( $callbacks[ $priority ][ $filter_id ] );
				// and if it was the only filter in that priority, unset that priority
				if ( empty( $callbacks[ $priority ] ) ) {
					unset( $callbacks[ $priority ] );
				}
				// and if the only filter for that tag, set the tag to an empty array
				if ( empty( $callbacks ) ) {
					$callbacks = array();
				}
				// Remove this filter from merged_filters, which specifies if filters have been sorted
				unset( $GLOBALS['merged_filters'][ $tag ] );
			}

			return TRUE;
		}
	}

	return FALSE;
}

/**
 * Now we remove the filter/action so it doesn't show on the cart page
 */
remove_class_filter( 'woocommerce_proceed_to_checkout', 'WC_Gateway_PPEC_Cart_Handler', 'display_paypal_button', 20 );

This is for this plugin:
https://wordpress.org/plugins/woocommerce-gateway-paypal-express-checkout/

Thank you for making this, I was going to remove this button as well. However, I added the code to functions.php, and it didn't work. So is there any small bug, or did I use it wrong?

@pydun if you're using WordPress 4.7+ please make sure to use the latest version of the remove_class_filter which can be found here:
https://gist.github.com/tripflex/c6518efc1753cf2392559866b4bd1a53

I've also updated this gist as well

@tripflex I added the latest code, but unfortunately, it doesn't work.
What can I check?
Thanks!!

@dabesa me too