How to check multiple words exist in the string? (returns true it there is at least one of those words)

问题

I have a string like this:

$str = "it is a test";

I want to check it for these words: it, test. I want to it returns true if there is at least one of those words in the string.

Here is what I did: (though it does not work)

$keywords = array ('it', 'test');
if(strpos($str, $keywords) !== false){ echo 'true';}
else echo 'false';

How can I do that?

回答1:

simply checking using preg_match, you can add many different words in the pattern, just use a separator | in between words

$str = "it is a test";
if (preg_match("[it|test]", $str) === 1)
{
    echo "it matches";
}

Sorry I didnt know you were dealing with other languages, you can try this

$str = "你好 abc efg";
if (preg_match("/\b(你好|test)\b/u", $str) === 1)
{
    echo "it matches";
}

I also need to mention that \b means word boundary, so it will only matches the exact words

回答2:

The easiest way would be to user the explode function, this looks like:

$str = "it is a test"; // Remember your quotes!

$keywords = array ('it', 'test');

$str_array = explode(" ", $str);
$foundWords = [];
foreach ($keywords as $key)
{
    if (in_array($key, $str_array))
    {
        $foundWords[] = $key;
    }
}
foreach($foundWords as $word)
{
    print("Word '{$word}' was found in the string '{$str}'<br />");
}

This is a function with printing also

This gave me the result:

Word 'it' was found in the string 'it is a test'
Word 'test' was found in the string 'it is a test'

I think the issue with your code is that it is trying to match an array as a whole to the string, try doing it inside a foreach loop.

Another way would be something such as:

$keywords = array ('it', 'test');
echo (strpos($srt, $keywords[0]) ? "true" : "false");
echo (strpos($srt, $keywords[1]) ? "true" : "false");

回答3:

I am not sure, so sorry of i am wrong. I think strpos doesnt work with arrays?

Try to do:

$array = ('it', 'test');
for($i=0;$i<$array.length;$i++){

//here the strpos Method but with $array[$i] }

来源：https://stackoverflow.com/questions/33653956/how-to-check-multiple-words-exist-in-the-string-returns-true-it-there-is-at-le

标签

php

strpos