<?php
$string = "ABCDE ";
$array = array();
$array[] = trim($string);
$array[] = preg_replace('/\s+/', '', $string);
$array[] = preg_replace('/\s\s+/', '', $string);
$array[] = trim(preg_replace('/[\s\t\n\r\s]+/', '', $string));
$array[] = preg_replace('/~\x{00a0}~siu/', '', $string);
$array[] = str_replace(array(" ", "\t", "\n", "\r", "\x0B", "\f", "\0"), '', $string);
var_dump($array);
preferences:
40.45 ms | 402 KiB | 5 Q