Untitled

$sentence = "I dont give a badwordtwo";

$values = array("badwordone","badwordtwo","badwordthree","badwordfour");

$var = "This is my phrase.";
$var = str_ireplace( array("this", "phrase"), array("****", "*****"), $var);

$var = str_ireplace( array("this", "phrase"), "", $var);

<?PHP
$banned = array('bad','words','like','these');

$looksLikeSpam = false;
foreach($banned as $naughty){
    if (strpos($string,$naugty) !== false){
        $looksLikeSpam=true;
    }
}

if ($looksLikeSpam){
   echo "You're GROSS!  Just... ew!";
   die();
}
?>

$sentence = "I dont give a badwordtwo";
$values = array("badwordone","badwordtwo","badwordthree","badwordfour");
$s = explode(" ",$sentence);
foreach ($s as $a=>$b){
    if (in_array($b, $values)) {
        echo "Got $b";
    }
}

$ php test.php
Got badwordtwo

$sentence = "I dont give a badwordtwo";
$values = array("badwordone","badwordtwo","badwordthree","badwordfour");
$s = explode(" ",$sentence);
var_dump(array_intersect($s, $values));

$ php test.php
array(1) {
  [4]=>
  string(10) "badwordtwo"
}

<?php
// Provides: <body text='black'>
$bodytag = str_replace("%body%", "black", "<body text='%body%'>");

// Provides: Hll Wrld f PHP
$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
$onlyconsonants = str_replace($vowels, "", "Hello World of PHP");

// Provides: You should eat pizza, beer, and ice cream every day
$phrase  = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy   = array("pizza", "beer", "ice cream");

$newphrase = str_replace($healthy, $yummy, $phrase);

// Provides: 2
$str = str_replace("ll", "", "good golly miss molly!", $count);
echo $count;
?>

public static function censor($str, $badwords, $replacement = '#', $replace_partial_words = TRUE)
{
  foreach ((array) $badwords as $key => $badword)
  {
    $badwords[$key] = str_replace('*', 'S*?', preg_quote((string) $badword));
  }

  $regex = '('.implode('|', $badwords).')';

  if ($replace_partial_words === FALSE)
  {
    $regex = '(?<=b|s|^)'.$regex.'(?=b|s|$)';
  }

  $regex = '!'.$regex.'!ui';

  if (strlen($replacement) == 1)
  {
    $regex .= 'e';
    return preg_replace($regex, 'str_repeat($replacement, strlen('$1'))', $str);
  }

  return preg_replace($regex, $replacement, $str);
}