how do you auto increment sequence number in php-CodePudding

<?php

if(isset($_POST['merchantname']) && isset($_POST['firstname'])) {
       $data = "Merchant" . "," .$_POST['merchantname'] . "," . $_POST['firstname'] . "," 
          .$_POST['surname'] . "," . $_POST['regnumber'] . ","
            .$_POST['bankname'] . "," . $_POST['branchcode'] . ","
             .$_POST['accnumber'] . "," . $_POST['acctype'] . ","
               .$_POST['email'] . "," . $_POST['mobilenumber'] . "\n";
                  //.$_POST['field11'] . "\n" . $_POST['field12'] . "\n"
    //. $_POST['field13'] . "\n" . $_POST['field14'] . "\n";
 
   //$count = 0
    $number = 0;

    while ($number >=0 ) {
    echo str_pad ($number, 2, '0', STR_PAD_LEFT), '<br>';
    $number = $number  ; // or any rule you want.
}  
    $filename = "files/" .'Epays' . '_' . $_POST['merchantname'].'_' . date('Ymd').'_' . date('His').'_' .  $number .".txt";
    if (!file_exists($filename)) {
        $fh = fopen($filename,  'w') or die("Can't create file");
    }
    $ret = file_put_contents($filename, $data, FILE_APPEND | LOCK_EX);
    if($ret === false) {
        die('There was an error writing this file');
    }
    else {
        echo '<script type="text/javascript">
                        message1();
                    </script>';
        }
    }
      else {
            die('no post data to process');
   }




?>
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