Convert bytes to B, KB, MB, GB, TB, PB, EB, ZB, YB

Simple PHP function that formats the bytes to the desired form. Possible unit options are:

Byte (B)

Kilobyte (KB)

Megabyte (MB)

Gigabyte (GB)

Terabyte (TB)

Petabyte (PB)

Exabyte (EB)

Zettabyte (ZB)

Yottabyte (YB)

Function takes three parameter: (bytes mandatory, unit optional, decimals optional):

<?php
/* 
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.in/
*/

function byteFormat($bytes, $unit = "", $decimals = 2) {
 $units = array('B' => 0, 'KB' => 1, 'MB' => 2, 'GB' => 3, 'TB' => 4, 
   'PB' => 5, 'EB' => 6, 'ZB' => 7, 'YB' => 8);
 
 $value = 0;
 if ($bytes > 0) {
  // Generate automatic prefix by bytes 
  // If wrong prefix given
  if (!array_key_exists($unit, $units)) {
   $pow = floor(log($bytes)/log(1024));
   $unit = array_search($pow, $units);
  }
 
  // Calculate byte value by prefix
  $value = ($bytes/pow(1024,floor($units[$unit])));
 }
 
 // If decimals is not numeric or decimals is less than 0 
 // then set default value
 if (!is_numeric($decimals) || $decimals < 0) {
  $decimals = 2;
 }
 
 // Format output
 return sprintf('%.' . $decimals . 'f '.$unit, $value);
  }


?>

 Usage

<?php
/* 
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.in/
*/

echo byteFormat(4096, "B") ."\n";
echo byteFormat(8, "B", 2) . "\n";
echo byteFormat(1, "KB", 5) . "\n";
echo byteFormat(1073741824, "B", 0) . "\n";
echo byteFormat(1073741824, "KB", 0) . "\n";
echo byteFormat(1073741824, "MB") . "\n";
echo byteFormat(1073741824) . "\n";
echo byteFormat(1073741824, "TB", 10) . "\n";
echo byteFormat(1099511627776, "PB", 6) . "\n";



?>

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The Editorial Team of 4everTutorials consists of a group of PHP Professionals.