Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <?php
    $path = './randomdata.csv';
    if(isset($_GET['a'])) {
        $a = $_GET['a'];
       }
   else {
        $a = '';
       }
   switch($a){
       case 'pregled': pregled();break;
       default: ispis();
   }
   function ispis(){
        $slova=array();
        global $path;
        $sadrzaj = file($path);
        foreach($sadrzaj as $s){
            $redak = explode("|",$s);
            if(!in_array(substr($redak[4],0,1),$slova)){
                array_push($slova,substr($redak[4],0,1));
            }
            }
        unset($slova[0]);
        sort($slova);
       foreach($slova as $s){
           echo '<a href="?a=pregled&slovo='.$s.'">'.$s.'</a><br>';
       }


    }
   function pregled(){
        $slovo=$_GET['slovo'];
        global $path;
        $sadrzaj = file($path);
        echo '<table border=1>';
        foreach($sadrzaj as $s){
            echo '<tr>';
            $redak = explode("|",$s);
            if(substr($redak[4],0,1)==$slovo){
                echo '<td>'.$redak[0].'</td>';
                echo '<td>'.$redak[1].'</td>';
                echo '<td>'.$redak[2].'</td>';
                echo '<td>'.$redak[3].'</td>';
                echo '<td>'.$redak[4].'</td>';
                echo '<td>'.$redak[5].'</td>';
            }
            echo '</tr>';
    }
    echo '</table>';
}

    ?>
</body>
</html>