'Validate a multi select input field in HTML using PHP and JavaScript

I have a select input field in multiple properties. I have to validate (empty check) this field in both JavaScript and PHP. My code is like:

select multiple="multiple" name="frm_supply[]>
phpjavascripthtml


Solution 1:[1]

multiple selection values are stored in a array . so check the length of the array and according to ur validation rule, for example for atleast 2 selection ,the length of the array should be greater than 2 and so on

Solution 2:[2]

<select name="name">
   <?php
   for ($i = 0; $i < $count; $i++) {
      echo '<option value='$i'>$i</option>';
   }   
   ?>
</select>

Sources

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Source: Stack Overflow

Solution Source
Solution 1 chinni776
Solution 2 Alex Pliutau

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