https://paste.laravel.io/0cd741ad-a6...9-9d93d1c46ed5

<?php

    if(@$_POST){
        $islem = @$_POST['islem'];
        if($islem == 'sil'){
            file_put_contents('formveri.txt', '');
        }
    }

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Buton</title>
    <style>
        .butonum {
            border: none;
            border-radius: 15px;
            color: #4CAF50;
            padding: 8px 16px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            transition-duration: 0.2s;
            cursor: pointer;
        }
            
        .butonum1 {
            background-color: #4CAF50;
            color: white;
            border: 2px solid #28a4c9;
        }
            
        .butonum1:hover {
            background-color: #28a4c9;
            color: white;
        }
        
    </style>
</head>
<body>
    
    <form action="" method="post">
        <input type="hidden" name="islem" value="sil">
        <button type="submit" class="butonum butonum1">Sil</button>
    </form>

</body>
</html>