如何从字符串中删除那些不在 az 和 0-9 范围内的内容？

Question

我知道这个版本，但我正在寻找最简单的方法？

$string = "HeLLo$ my222 name is zolee0802343134";
$string = strtolower($string);
$replacement  = range (a, z);
$replacement2 = range (0, 9);

//
What comes here?
// 

I want to get this ->
$string = "hello my name is zolee";

Answer 1

为了简单起见，使用正则表达式。

$string = "HeLLo$ my222 name is zolee0802343134";
echo preg_replace("/[^a-z ]/i", "", $string);

http://codepad.org/eDmXrnYR

Answer 2

给你：http://codepad.org/3KuCG2yf

<?php

$string = "HeLLo$ my222 name is zolee0802343134";
echo preg_replace("/[^a-zA-Z ]/", "", $string);

?>