Explode a string into an array by delimiter

string-to-array.php

<?php

/**
 * Explode a string into an array by $delimiter and remove empty values.
 *
 * @param 	string $string    	String to convert.
 * @param 	string $delimiter 	Delimiter, defaults to ','.
 * @return 	array
 */
function prefix_string_to_array( $string, $delimiter = ',' ) {
	return is_array( $string ) ? $string : array_filter( explode( $delimiter, $string ) );
}