static function join($glue, array $list, callable $manipulator) {
		$glued = '';
		foreach ($list as $key => $value) {
			$item = $manipulator($key, $value);
			if ($item !== false) {
				$glued .= $glue.$item;
			}
		}

		if ( ! empty($glued)) {
			$glued = substr($glued, strlen($glue));
		}

		return $glued;
	}
static function join($glue, array $list, callable $manipulator) {
		$glued = '';
		foreach ($list as $key => $value) {
			$item = $manipulator($key, $value);
			if ($item !== false) {
				$glued .= $glue.$item;
			}
		}

		if ( ! empty($glued)) {
			$glued = substr($glued, strlen($glue));
		}

		return $glued;
	}
static function join ( $ glue , array $ list , callable $ manipulator ) { $ glued = '' ; foreach ( $ list as $ key => $ value ) { $ item = $ manipulator ( $ key , $ value ) ; if ( $ item !== false ) { $ glued .= $ glue . $ item ; } } if ( ! empty ( $ glued ) ) { $ glued = substr ( $ glued , strlen ( $ glue ) ) ; } return $ glued ; }
PHP join with a callback

This is slightly different from implode($glue, array_map) in that it can
ignore entries if the entry in question passes false out.

@return string
PHP join with a callback