Finding words in a string

Question

Can anyone suggest how I would do this: Say if I had the string $text which holds text entered by a user. I want to use an 'if statement' to find if the string contains one of the words $word1 $word2 or $word3 . Then if it doesn't, allow me to run some code.

if ( strpos($string, '@word1' OR '@word2' OR '@word3') == false ) {
    // Do things here.
}

I need something like that.

You want to run if all of them are absent, or atleast one of them is absent? — Dogbert, Aug 06 '11 at 15:54
possible duplicate of [PHP - If string contains one of these words](http://stackoverflow.com/questions/6966490/php-if-string-contains-one-of-these-words) — hakre, Aug 06 '11 at 15:58
Really sorry. The last question I made a mistake, so please if a mod could close/delete the last one. This one is much more helpful. — Joey Morani, Aug 06 '11 at 16:10

score 2 · Answer 1 · answered Aug 06 '11 at 15:52

2

if ( strpos($string, $word1) === false && strpos($string, $word2) === false && strpos($string, $word3) === false) {

}

answered Aug 06 '11 at 15:52

Dogbert

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score 2 · Accepted Answer · answered Aug 06 '11 at 15:59

More flexibile way is to use array of words:

$text = "Some text that containts word1";    
$words = array("word1", "word2", "word3");

$exists = false;
foreach($words as $word) {
    if(strpos($text, $word) !== false) {
        $exists = true;
        break;
    }
}

if($exists) {
    echo $word ." exists in text";
} else {
    echo $word ." not exists in text";
}

Result is: word1 exists in text

score 1 · Answer 3 · answered Aug 06 '11 at 16:13

Define the following function:

function check_sentence($str) {
  $words = array('word1','word2','word3');

  foreach($words as $word)
  {
    if(strpos($str, $word) > 0) {
    return true;
    }
  }

  return false;
}

And invoke it like this:

if(!check_sentence("what does word1 mean?"))
{
  //do your stuff
}

score 0 · Answer 4 · edited May 23 '17 at 11:47

0

As in my previous answer:

if ($string === str_replace(array('@word1', '@word2', '@word3'), '', $string))
{
   ...
}

edited May 23 '17 at 11:47

Community

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answered Aug 06 '11 at 16:00

hakre

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score 0 · Answer 5 · edited Jan 10 '12 at 11:26

0

It may be better to use stripos instead of strpos because it is case-insensitive.

edited Jan 10 '12 at 11:26

gmadd

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answered Aug 06 '11 at 16:01

Sergiy T.

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score 0 · Answer 6 · answered Aug 06 '11 at 16:08

0

you can use preg_match, like this

if (preg_match("/($word1)|($word2)|($word3)/", $string) === 0) {
       //do something
}

answered Aug 06 '11 at 16:08

laurac

429
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11

Finding words in a string

6 Answers6