[WordPress] Remove an Enqueued Stylesheet in WordPress

00-setup-a-hook.php

<?php

add_action( 'wp_enqueue_scripts', array( $this, 'remove_older_font_awesome' ), 99 );

01-define-the-hook.php

<?php

/**
 * Determines whether or not Font Awesome is already loaded. This is necessary because other plugins,
 * theme styles, or add-ons may include Font Awesome and we don't want to include it if it's already
 * been included.
 */
public function remove_older_font_awesome() {

	global $wp_styles;

	// Read all of the existing styles.
	$sources = array_map( 'basename', (array) wp_list_pluck( $wp_styles->registered, 'src' ) );

	// Look for any pre-existing Font Awesome styles.
	$result = array_search( 'font-awesome.min.css', $sources );
	if ( ! $result ) {
		$result = array_search( 'font-awesome.css', $sources );
	}

	// Deregister the pre-existing file.
	if ( $result ) {
		wp_deregister_style( $result );	
	}

}