Case insensitive array_search() with partial matches

array-find.php

<?php

/**
 * Case insensitive array_search() with partial matches.
 *
 * @param string $needle
 * @param array  $haystack
 * @return bool|int|string
 */
public static function array_find( $needle, array $haystack ) {
	$found = false;
	foreach ( $haystack as $key => $value ) {
		if ( false !== stripos( $needle, $value ) ) {
			$found = $key;
			break;
		}
	}
	return $found;
}