Check if text contains certain words

[lip9000]

Basically I want to check a bunch of text for certain swear words, and if it contains at least 1 word, then throw out an error. All I can find on the net is replacing text with other text, I dont want to replace it, I just want to see if it's there.

 

So maybe have an array full of swear words, then after the form is submitted check if that text contains any of those words, if yes, then do something.

 

Thanks heaps in advance!

[xdracox]

Use the strpos() function.

$string = 'Find the word swear.';
if ( strpos($string, 'swear') !== false )
{
    echo 'I found swear!';
}

[genericnumber1]

You may want to reconsider and just replace it with !@$# characters (or whatever) as some words can contain other words (searches for "word" will find a match in the above code for instance).

 

If you want the search to be case insensitive, use stripos instead of strpos in the above code.

[lip9000]

So if I wanted to use multiple different words would the code go like this?

 

$string = 'Find the word swear.';
if ( stripos($string, 'swear,this,that,another,badword,andthis') !== false )
{
    echo 'I found swear!';
}

 

???????

[genericnumber1]

No, you could do something like

 

<?php
function wordsExist(&$string, $words) {
    foreach($words as &$word) {
        if(stripos($string, $word) !== false) {
            return true;
        }
    }
    return false;
}

$string = 'Find the word swear.';
if (wordsExist($string, array('swear','this','that','another','badword','andthis'))) {
    echo 'I found one of the words!';
}
?>

[lip9000]

Outstanding! Thanks heaps!

[The Little Guy]

You can do this if you want:

 

// Array of Bad words
$words = array('fuck','shit','damn','ass');
// Array of extention to words
$exten = array('','ed','ing','s');
// Input string
$str = 'this is a fucking sentence';
// Create an array from input
$string = explode(' ',strtolower($str));
// Create a new array for all combinations of swear words
$wordList = array();
// Add all combinations to the new array
foreach($words as $word){
   foreach($exten as $ext){
      $wordList[] = $word.$ext;
   }
}
// Loop through each input word, and check if it is a bad word or not
// FALSE = Good Words
// TRUE = Bad Words
$badWord = FALSE;
foreach($string as $s){
   if(in_array($s, $wordList)){
      $badWord = TRUE;
   }
}
// Do something if output is good or bad in this case display a message
if($badWord)
   echo 'This input contains inapropriate content';
else
   echo 'This is valid input!';