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PHP面试有关问题考卷03

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Release: 2016-06-13 13:03:16
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PHP面试问题考卷03
4、使用哪些工具进行版本控制?
SVN

5、如何实现字符串翻转?

$str = "Holle World!";

echo strrev($str);//!dlroW elloH

echo t_strrev($str);//!dlroW elloH


function t_strrev($str) {
	$n_str = '';
	for ($i=strlen($str); $i>=0; $i--) {
		$n_str .= $str[$i];
	}
	return $n_str;
} // end func
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这样是没问题,不过应该不是这样的。

解决中文乱码方法:
/**
* 反转utf8的字符串,使用mb开头的函数
* @param string $str
* @return string
*/
function t_strrev($str) {
	$len = mb_strlen($str, 'UTF-8');
    $string = '';
    for ($i = $len - 1; $i >= 0; $i--) {
       $string .= mb_substr($str, $i, 1, 'UTF-8');
    }
    return $string;
} // end func
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