Question

我有一个文本文件，用于维护单词列表。

我要做的是将一个字符串（句子）传递给此函数，如果该字符存在于文本文件中，则从字符串中删除该字。

<?php
error_reporting(0);

$str1= "the engine has two ways to run: batch or conversational. In batch, expert system has all the necessary data to process from the beginning";

common_words($str1);

function common_words($string) { 
$file = fopen("common.txt", "r") or exit("Unable to open file!");
$common = array();
while(!feof($file)) {
  array_push($common,fgets($file));
  }
fclose($file);

$words = explode(" ",$string);
print_r($words);

for($i=0; $i <= count($words); $i+=1) {
    for($j=0; $j <= count($common); $j+=1) {
            if($words[$i] == $common[$j]){
            unset($words[$i]);
            }
        }
    } 
}
?>

但它似乎不起作用。字符串中的常用单词未被删除。相反，我得到了与我开始的字符串相同的字符串。

我认为我做错了。什么是正确的方法，我做错了什么？

Answer 1

尝试使用str_replace()：

foreach($common as $cword){
    str_replace($cwrod, '', $string); //replace word with empty string
}

或完整：

<?php
error_reporting(0);

$str1= "the engine has two ways to run: batch or conversational. In batch, expert system has all the necessary data to process from the beginning";

common_words($str1);

function common_words(&$string) { //changes the actual string passed with &

    $file = fopen("common.txt", "r") or exit("Unable to open file!");

    $common = array();
    while(!feof($file)) {
        array_push($common,fgets($file));
    }
    fclose($file);

    foreach($common as $cword){
        str_replace($cword, '', $string); //replace word with empty string
    }
}
?>

Answer 2

就行了

        if($words[$i] == $common[$j]){

将其更改为

        if(in_array($words[$i],$common)){

并删除第二个for循环。

php for循环删除常用单词

2 个答案: