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/**
 * Creates a temporary file in system folder.
 * @param string $prefix Prefix of filename.
 * @return string Path to temp file.
 */
function temp_file($prefix = 'tmp')
{
  return tempnam(sys_get_temp_dir(), $prefix);
}

/**
 * Converts a two-dimensional matrix into array.
 * For example, this code
 *   $matrix = [[1, 2],
 *              [3, 4]];
 *   matrix_array($matrix);
 * Produces following result
 *   [1, 2, 3, 4]
 * @param array $array Matrix to flat
 * @return array Array
 */
 function matrix_array(array $matrix)
 {
  $result = array();
  $rows = count($matrix);
  for ($i = 0; $i < $rows; $i++)
  {
    $result = array_merge($result, $matrix[$i]);
  }
  return $result;
 }

/**
 * Loads shared library.
 */
function load_lib($n, $f = null) {
    return extension_loaded($n) or dl(((PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '') . ($f ? $f : $n) . '.' . PHP_SHLIB_SUFFIX);
}