<?php

function make_display_float( $float, $precision )
{
  // $float is really a float value here!
  // e.g. $float === 3.0249999999;
  $float = round( $float, $precision+1 );
  return( round($float, $precision) );
}

// say you have a real float number,
$total = floatval( 424.0249999 );

// to see the different results on a web page, test the following

  // with round()
  $ttl_after_round = round( $total, 2 );
  // with custom function
  $ttl_for_display = make_display_float( $total, 2 );

// echo the results
echo "\$ttl_after_round is $ttl_after_round<br />\n";
echo "\$ttl_for_display is $ttl_for_display";

?>