Check if string contains word in array [duplicate]

This is for a chat page. I have a $string = "This dude is a mothertrucker". I have an array of badwords: $bads = array('truck', 'shot', etc). How could I check to see if $string contains any of the words in $bad?
So far I have:

        foreach ($bads as $bad) {
        if (strpos($string,$bad) !== false) {
            //say NO!
        }
        else {
            // YES!            }
        }

Except when I do this, when a user types in a word in the $bads list, the output is NO! followed by YES! so for some reason the code is running it twice through.

Solution 1:

function contains($str, array $arr)
{
    foreach($arr as $a) {
        if (stripos($str,$a) !== false) return true;
    }
    return false;
}

Solution 2:

1) The simplest way:

if ( in_array( 'three',  ['one', 'three', 'seven'] ))
...

2) Another way (while checking arrays towards another arrays):

$keywords=array('one','two','three');
$targets=array('eleven','six','two');
foreach ( $targets as $string ) 
{
  foreach ( $keywords as $keyword ) 
  {
    if ( strpos( $string, $keyword ) !== FALSE )
     { echo "The word appeared !!" }
  }
}

Solution 3:

can you please try this instead of your code

$string = "This dude is a mothertrucker";
$bads = array('truck', 'shot');
foreach($bads as $bad) {
    $place = strpos($string, $bad);
    if (!empty($place)) {
        echo 'Bad word';
        exit;
    } else {
        echo "Good";
    }
}

Solution 4:

You can flip your bad word array and do the same checking much faster. Define each bad word as a key of the array. For example,

//define global variable that is available to too part of php script
//you don't want to redefine the array each time you call the function
//as a work around you may write a class if you don't want global variable
$GLOBALS['bad_words']= array('truck' => true, 'shot' => true);

function containsBadWord($str){
    //get rid of extra white spaces at the end and beginning of the string
    $str= trim($str);
    //replace multiple white spaces next to each other with single space.
    //So we don't have problem when we use explode on the string(we dont want empty elements in the array)
    $str= preg_replace('/\s+/', ' ', $str);

    $word_list= explode(" ", $str);
    foreach($word_list as $word){
        if( isset($GLOBALS['bad_words'][$word]) ){
            return true;
        }
    }
    return false;
}

$string = "This dude is a mothertrucker";

if ( !containsBadWord($string) ){
    //doesn't contain bad word
}
else{
    //contains bad word
}

In this code we are just checking if an index exist rather than comparing bad word with all the words in the bad word list.
isset is much faster than in_array and marginally faster than array_key_exists.
Make sure none of the values in bad word array are set to null.
isset will return false if the array index is set to null.