Automatic login to Adminer using Wordpress DB credentials (wp-config.php)

adminer-wp.php

<?php

function define_find( $filename = 'wp-config.php' ) { // https://github.com/interconnectit/Search-Replace-DB/blob/master/index.php#L726

  if ( $filename == 'wp-config.php' ) {
    $filename = dirname( __FILE__ ) . '/' . basename( $filename );

    // look up one directory if config file doesn't exist in current directory
    if ( ! file_exists( $filename ) )
      $filename = dirname( __FILE__ ) . '/../' . basename( $filename );
  }

  if ( file_exists( $filename ) && is_file( $filename ) && is_readable( $filename ) ) {
    $file = @fopen( $filename, 'r' );
    $file_content = fread( $file, filesize( $filename ) );
    @fclose( $file );
  }

  preg_match_all( '/define\s*?\(\s*?([\'"])(DB_NAME|DB_USER|DB_PASSWORD|DB_HOST|DB_CHARSET|DB_COLLATE)\1\s*?,\s*?([\'"])([^\3]*?)\3\s*?\)\s*?;/si', $file_content, $defines );

  if ( ( isset( $defines[ 2 ] ) && ! empty( $defines[ 2 ] ) ) && ( isset( $defines[ 4 ] ) && ! empty( $defines[ 4 ] ) ) ) {
    foreach( $defines[ 2 ] as $key => $define ) {

      switch( $define ) {
        case 'DB_NAME':
          $name = $defines[ 4 ][ $key ];
          break;
        case 'DB_USER':
          $user = $defines[ 4 ][ $key ];
          break;
        case 'DB_PASSWORD':
          $pass = $defines[ 4 ][ $key ];
          break;
        case 'DB_HOST':
          $host = $defines[ 4 ][ $key ];
          break;
        case 'DB_CHARSET':
          $char = $defines[ 4 ][ $key ];
          break;
        case 'DB_COLLATE':
          $coll = $defines[ 4 ][ $key ];
          break;
      }
    }
  }

  return array(
    'host' => $host,
    'name' => $name,
    'user' => $user,
    'pass' => $pass,
    'char' => $char,
    'coll' => $coll
  );
}

$creds = define_find();

?>

<form action='adminer.php' method='post' name='login'>
<input name='auth[driver]' value="server">
<input name="auth[server]" value="<?= $creds['host'] ?>">
<input name="auth[username]" value="<?= $creds['user'] ?>">
<input name="auth[password]" value="<?= $creds['pass'] ? $creds['pass'] : 'any_password' ?>">
<input name="auth[db]" value="<?= $creds['name'] ?>">
</form>

<script>
    window.onload = function(){
        document.forms['login'].submit();
    }
</script>