Php str_ireplace function help

<?
$text="this is class";
$text  = str_ireplace("ass", "a**", $text);
echo $text;
?>

PHP:

Output: this is cla**
The above code replace class as cla**
But i want to replace only exact word ass.

I need the output should be: this is class.

 

$text="this is an ass way class, but as ass classes go it should work";
$text = preg_replace('#\bass\b#', 'a**', $text);
echo $text;

PHP:

 

Thanks, but the scenario is:


$text="this is an ass way class, but as dog hotdog classes go it should work";
$badword=array('ass','dog');
$replace_with=array('a**','d**');
$text = preg_replace('#\bass\b#', 'a**', $text);
echo $text;

how to pass array in this line $text = preg_replace('#\bass\b#', 'a**', $text);

 

$text="this is an ass way class, but as dog hotdog classes go it should work";
$badword=array('ass' => 'a**','dog' => 'd**');
foreach($badword as $key=>$value)
{
$text = preg_replace('#\b'.$key.'\b#',$value, $text);
}
echo $text;

PHP:

 

<?
$text="this is class";
$text  = str_ireplace(" ass ", " a** ", $text);
echo $text;
?>

Code (markup):

 

Nice, I done that but the code was lengthy you given the simplest one
but there should one change

<?
$text="this is class";
$text = str_ireplace("ass ", "a** ", $text);
echo $text;
?>

Replace left whitespace other wise first word will not match

 

<? 
$badwords = array("ass","a$$","a55","Ass","ASS","A$$","A$$");
$text="this is an ass way class, but as dog hotdog classes go it should work";
$clean = ReplaceBadWords($text,$badwords,"a**);
echo $clean;

function ReplaceBadWords($str, $bad_words, $replace_str){
    if (!is_array($bad_words)){ $bad_words = explode(',', $bad_words); }
    for ($x=0; $x < count($bad_words); $x++){
        $fix = isset($bad_words[$x]) ? $bad_words[$x] : '';
        $_replace_str = $replace_str;
        if (strlen($replace_str)==1){ 
            $_replace_str = str_pad($_replace_str, strlen($fix), $replace_str);
        }
        $str = preg_replace('/'.$fix.'/i', $_replace_str, $str);
    }
    return $str;
}
?>

Code (markup):

You could also modify this function to use key->value badword->replacement as tvoodoo shows in his code. To be able to handle a wider variety of bad words