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  • From the following example, you can learn the usage of form, textarea, isset, strtolower and str_replace. Every word 'love' you type in the text box, the codes will change with the word 'hate'.

    <?php
    $find = 'love';
    $replace = 'hate';
    if(isset($_POST['user_input']) && !empty($_POST['user_input'])){
       $user_input = strtolower($_POST['user_input']);
       $user_input_new = str_replace($find, $replace, $user_input);
       echo $user_input_new.'</br>';
    }else{
      echo 'Please fill in the text box!';
    }
    ?>
    
    <form action = "wordcensoring.php" method = "POST">
    <textarea name = "user_input" cols = "40" widths = "500"></textarea></br></br>
    <input type = "submit" value = "Submit">
    </form>