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reverse_words.php
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37 lines (32 loc) · 1.02 KB
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<?php
/**
* Author: Huang
* Date: 2021/4/30
* Time: 14:37
*/
//输入一个英文句子，翻转句子中单词的顺序，但单词内字符的顺序不变。为简单起见，标点符号和普通字母一样处理。例如输入字符串"I am a student. "，则输出"student. a am I"。
//
//来源：力扣（LeetCode）
//链接：https://leetcode-cn.com/problems/fan-zhuan-dan-ci-shun-xu-lcof
//著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。
function reverse_words($string)
{
// $arr = array_filter(explode(' ', $string));
//
// return implode(' ', array_reverse($arr));
$arr = explode(' ', trim($string));
// var_dump($arr);die();
$len = count($arr);
$result = [];
for ($i = $len - 1; $i >= 0; $i--){
if(!$arr[$i]){
continue;
}
$result[] = $arr[$i];
}
return implode(' ', $result);
}
$string = " hello world! ";
$string = "the sky is blue";
$string = "a good example";
print_r(reverse_words($string));