Scales and integer to defined steps.

gistfile1.php

<?php
/**
 * Scales and integer to defined steps.
 * 
 * @param int $int
 *   The integer to test against.
 * @param int $min
 *   The minimum number of the range.
 * @param int $max
 *   The maximum number of the range.
 * @param int $steps
 *   The total steps to use in the scale.
 * 
 * @return int
 *   Returns the appropriate step if $int is within the range of $min and $max.
 *   If $int is below or above the provided limits, 1 or $steps will be
 *   returned respectively.
 */
function int_scale($int, $min, $max, $steps = 10) {
  // If $steps are defined as 1 or lower, or if $int is below the range,
  // return 1.
  if ($steps <= 1 || $int <= $min) return 1;

  // If $int is above the provided range, return the max step.
  if ($int > $max) return $steps;

  $step_range = ($max - $min ) / ($steps);
  return ceil(($int - $min) / $step_range);
}