如何找出 php 中的字符串中是否有多余的单词


How to find out if there is any redundant word in string in php?

我需要找出字符串中是否有多余的单词。是否有任何函数可以为我提供真/假结果。

例:

 $str = "Hey! How are you";
 $result = redundant($str);
 echo $result ; //result should be 0 or false

但对于:

 $str = "Hey! How are are you";
 $result = redundant($str);
 echo $result ; //result should be 1 or true

谢谢

您可以使用 explode 生成一个包含字符串中所有单词的数组:

$array = explode(" ", $str);

然后你可以证明数组是否包含重复项,并具有以下答案中提供的函数:https://stackoverflow.com/a/3145660/5420511

我认为

这就是您要做的,这会在标点符号或空格上拆分。如果需要重复的单词,可以使用注释掉的行:

$str = "Hey! How are are you?";
$output = redundant($str); 
echo $output;
function redundant($string){
    $words = preg_split('/[[:punct:]'s]+/', $string);
    if(max(array_count_values($words)) > 1) {
        return 1;
    } else {
        return 0;
    }
    //foreach(array_count_values($words) as $word => $count) {
    //  if($count > 1) {
    //      echo '"' . $word . '" is in the string more than once';
    //  }
    //}
}

引用:

http://php.net/manual/en/function.array-count-values.php
http://php.net/manual/en/function.max.php
http://php.net/manual/en/function.preg-split.php

正则表达式演示:https://regex101.com/r/iH0eA6/1