number of word counting in textbox using php get method

<form action="<?php htmlentities($_SERVER['PHP_SELF']);?>" method="get">
<input type="text" name="word" placeholder="enter text here">
<input type="submit" value="submit" name="submit">
</form>

<?php
if(isset($_GET['submit'])){
    $word=$_GET['word'];
    $word1=explode(' ',$word);
    $result=array_combine($word1,array_fill(0,count($word1),0));
    foreach($word1 as $words){
        $result[$words]++;
    }
    foreach($result as $result1 => $count){
   
        //echo "count"."$result1 "." .$count.";
        echo"<table border='5px' width='10%'><tr><th>$result1</th><td>$count</td></tr>";
    }
}
?>