Simple STRING TO HASH

<?php

/*
  Simple STRING TO HASH
  Code by Altenator IWnet
*/

echo "<center><form method='post'>
Insert STRING Here : <input type='text' name='hash_input' value='' /><br><br>
<input type='submit' name='submit_hash' value='Encode' /><br><br>";

if (isset($_POST['submit_hash'])) {
    if (isset($_POST['hash_input'])) {
        $hash_input = $_POST['hash_input'];
        }

if ($hash_input=="") {  // show error if nothing inserted in input box
    echo 'Nothing Inserted!';
} else {
    if (isset($hash_input)) {
        foreach (hash_algos() as $hash_setoption) {    // set to use all hash function
        $calculate_hash = hash($hash_setoption, $hash_input, false); // calculate all hash and declare variable
        echo "$hash_setoption&#40;&#34;<font color='#001EFF'>$hash_input</font>&#34;&#41; = &#34;<font color='#5BC740'>$calculate_hash</font>&#34;<br>";   // output
    }
    }
}
}
?>