Set Limit Or Restrict to Enter Fix Number of words to textbox in php

Set Limit Or Restrict to Enter Fix Number of words to textbox in php

<?php $number_words = 30;?>  //Set Number of words Enter in TextBox

<!--Javascript Code START -->
<script type="text/javascript">
$(function() {
    //set up text length counter
    var number_words = "<?php echo $number_words;?>";
    $('#id_limited_textarea').keyup(function() {
        update_chars_left(number_words, $('#id_limited_textarea')[0], $('#text_chars_left'));
    });
    //and fire it on doc ready, too
    update_chars_left(number_words, $('#id_limited_textarea')[0], $('#text_chars_left'));

});

function update_chars_left(max_len, target_input, display_element) {
   var text_len = target_input.value.length;
   if (text_len >= max_len) {
       target_input.value = target_input.value.substring(0, max_len);        display_element.html("0");
   } else {
       display_element.innerHTML(max_len - text_len);
   }
}
</script>
<!--Javascript Code END -->

<div class="container blog all-projects">
  <div class="row">
    <div class="span12">
        <form name="myform" METHOD=POST>
        <textarea style="background-color:f0f0f0; border 1px border:1px solid #afc784;" id="id_limited_textarea" name="comment" rows="4" cols="40" "></textarea><br>
        <span id="text_chars_left"></span>
        </form>
    </div>
  </div>
</div>

NOTE :-  Copy and paste this code in php file and check