testShortNumberFormatFunctions.php

<?php
set_time_limit(0);

function intWithStyle($n)
{
    if ($n < 1000) return $n;

    $suffix = ['','k','M','G','T','P','E','Z','Y'];
    $zeros = strlen($n)/3;

    $power = is_float($zeros) ? (int) $zeros : $zeros - 1;
    return round($n/(1000**$power),3).$suffix[$power];
};

function floorLogRound ($n)
{

if ($n < 1000) return $n;

$suffix = ['','k','M','G','T','P','E','Z','Y'];

$power = floor(log($n, 1000));

return round($n/(1000**$power),3).$suffix[$power];

};

function floorLogFormat($n) {
  if ($n < 1000) return $n;

  $suffix = ['','k','M','G','T','P','E','Z','Y'];
  $power = floor(log($n, 1000));

  return number_format($n/(1000**$power),3).$suffix[$power];
}

$max_exponent = 26;

$ns = [];
for($i = 0; $i <= $max_exponent; $i++) {
  $ns[] = 10**$i;
}


$runs = 100000;
$total_intWithStyle = 0;
$total_floorLogRound = 0;
$total_floorLogFormat = 0;
$fastest_intWithStyle = INF;
$fastest_floorLogRound = INF;
$fastest_floorLogFormat = INF;
$slowest_intWithStyle = 0;
$slowest_floorLogRound = 0;
$slowest_floorLogFormat = 0;

for ($i=0; $i < $runs; $i++) {

$start_intWithStyle = microtime(true);
foreach($ns as $n){
 intWithStyle($n);
}
$end_intWithStyle = microtime(true);
$time_intWithStyle = $end_intWithStyle - $start_intWithStyle;
if ($time_intWithStyle > $slowest_intWithStyle) {
  $slowest_intWithStyle = $time_intWithStyle;
}
if ($time_intWithStyle < $fastest_intWithStyle) {
  $fastest_intWithStyle = $time_intWithStyle;
}
$total_intWithStyle += $time_intWithStyle;

$start_floorLogRound = microtime(true);
foreach($ns as $n)
 floorLogRound($n);
$end_floorLogRound = microtime(true);
$time_floorLogRound = $end_floorLogRound - $start_floorLogRound;
if ($time_floorLogRound > $slowest_floorLogRound) {
  $slowest_floorLogRound = $time_floorLogRound;
}
if ($time_floorLogRound < $fastest_floorLogRound) {
  $fastest_floorLogRound = $time_floorLogRound;
}
$total_floorLogRound += $time_floorLogRound;

$start_floorLogFormat = microtime(true);
foreach($ns as $n)
 floorLogFormat($n);
$end_floorLogFormat = microtime(true);
$time_floorLogFormat = $end_floorLogFormat - $start_floorLogFormat;
if ($time_floorLogFormat > $slowest_floorLogFormat) {
  $slowest_floorLogFormat = $time_floorLogFormat;
}
if ($time_floorLogFormat < $fastest_floorLogFormat) {
  $fastest_floorLogFormat = $time_floorLogFormat;
}
$total_floorLogFormat += $time_floorLogFormat;
}
?>
<table>
<thead>
  <th></th>
  <th>intWithStyle</th>
  <th>floorLogRound</th>
  <th>floorLogFormat</th>
</head>
<tbody>
  <tr>
    <th>Fastest</th>
    <td><?= $fastest_intWithStyle ?></td>
    <td><?= $fastest_floorLogRound ?></td>
    <td><?= $fastest_floorLogFormat ?></td>
  </tr>
  <tr>
    <th>Slowest</th>
    <td><?= $slowest_intWithStyle ?></td>
    <td><?= $slowest_floorLogRound ?></td>
    <td><?= $slowest_floorLogFormat ?></td>
  </tr>
  <tr>
    <th>Total</th>
    <td><?= $total_intWithStyle ?></td>
    <td><?= $total_floorLogRound ?></td>
    <td><?= $total_floorLogFormat ?></td>
  </tr>
  <tr>
    <th>Average</th>
    <td><?= $total_intWithStyle  / $runs?></td>
    <td><?= $total_floorLogRound  / $runs?></td>
    <td><?= $total_floorLogFormat  / $runs?></td>
  </tr>
</tbody>
</table>