Call a php custom function that return a <div> inside another <div>

Hello;
With these codes below i create 6 <div> that arrange in 2 columns and 3 rows,and then call custom function writeMsg() that return a div inside each of 6 <div>,but the output has problem,and return <div> doesn't appear inside each one of created div.

Thanks for your help.

php codes

  <?php
 function writeMsg() {
 $tab ="<div class='functiontest'>";
 echo "test";
 $tab .="</div>";
 return $tab;
 }
 $test = writeMsg();
  echo "<div class='wrapper'>";
   for( $i=0; $i < 6; $i++ ){
    echo "<div>" . $test . "</div>";
   }
  echo "</div>";
  ?>

css

 .functiontest{
    width:200px;
    height:200px;
    display:block;
    background-color:#F4F5BD;
    float:left;
   }
   .wrapper{
    background-color:#F7ABAC;
    display:block;
    width:1000px;
    min-height:1000px;
    float:none;
    clear:both;
    box-sizing:border-box;
    }
   .wrapper div{
    width:330px;
    height:300px;
    border:1px solid black;
    float:left;
    margin-left:7px;
    margin-bottom:10px;
    display: block;
    background:#cccccc;
    text-align: center;
    }
   .wrapper div:nth-child(2n+1){
    clear:left;
    }