Generate a visual copy and paste friendly random password using OpenSSL and PHP

pass.php

#!/usr/bin/php
<?php

$length = 10;

if ($argc > 1) {
  if ($argv[1] == '-h' || $argv[1] == '--help') {
    echo basename($argv[0]) . ' [-h|--help] [length]' . PHP_EOL;
    echo 'length defaults to 10' . PHP_EOL;
    exit;
  } elseif ((int) $argv[1] > 0) {
    $length = $argv[1];
  }
}

$hash = '';
while (strlen($hash) < $length) {
//  $hash .= base64_encode(mt_rand().mt_rand());
  $hash .= base64_encode(openssl_random_pseudo_bytes($length));
  $hash = preg_replace('/[^a-zA-Z0-9]/', '', $hash);  // Base 62
  $hash = str_replace(str_split('O0Il12Z5S'), '', $hash); // avoid pain with visual copy/paste
  $hash = preg_replace(array('/v+/','/V+/'), array('v', 'V'), $hash);
}
$hash = substr($hash, 0, $length);

echo $hash . PHP_EOL;
?>

This is a script that I have been using since 2013 to generate passwords for web page registrations.