Format bytes to kilobytes megabytes gigabytes

Question

Scenario  the size of various files are stored in a database as bytes  What s the best way to format this size info to kilobytes  megabytes and gigabytes  For instance I have an MP3 that Ubuntu displays as  5 2 MB  5445632 bytes    How would I display this on a web page as  5 2 MB  AND have files less than one megabyte display as KB and files one gigabyte and above display as GB

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Base on Leo s answer  add    Support for negative Support 0  lt  value  lt  1   Ex  0 2  will cause log value    negative number     If you want max unit to Mega  change to  units   explode        K M       function formatUnit  value   precision   2         units   explode        K M G T P E Z Y         if   value  lt  0            return  -    formatUnit abs  value               if   value  lt  1            return  value    units 0               power   min          floor log  value  1024            count  units  - 1             return round  value   pow 1024   power    precision     units  power

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Extremely simple function to get human file size   Original source  http   php net manual de function filesize php 106569  Copy paste code    lt  php function human filesize  bytes   decimals   2       sz    BKMGTP      factor   floor  strlen  bytes  - 1    3     return sprintf      decimals f    bytes   pow 1024   factor       sz  factor       gt

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I did this converting all input to byte and so converting to any output needed  Also  I used a auxiliar function to get base 1000 or 1024  but left it flex to decide use 1024 on popular type  without  i   like MB instead of MiB         public function converte binario  size 0  format in  B   format out  MB   force in 1024 false  force out 1024 false  precisao 5  return format true  decimal      centena           out   false       if   is numeric  size    amp  amp    size gt 0             in data    this- gt converte binario aux  format in  force in 1024            out data    this- gt converte binario aux  format out  force out 1024               se formato de entrada e sa  da foram encontrados         if    isset  in data  sucesso      amp  amp    in data  sucesso    true    amp  amp    isset  out data  sucesso      amp  amp    out data  sucesso    true                    converte formato de entrada para bytes               size bytes in    size    pow  in data  base     in data  pot                   size byte out    pow  out data  base     out data  pot                     transforma bytes na unidade de destino              out   number format  size bytes in    size byte out  precisao  decimal  centena               if  return format                    out     format out                                    return  out     public function converte binario aux  format false  force 1024 false        out            out  sucesso     false       out  base     0       out  pot     0      if  is string  format   amp  amp   strlen  format  gt 0              format   trim strtolower  format             units 1000     b   kb    mb    gb    tb    pb    eb    zb    yb              units 1024     b   kib   mib   gib   tib   pib   eib   zib   yib             pot   array search  format  units 1000           if   is numeric  pot    amp  amp    pot gt  0                 out  pot      pot               out  base     1000               out  sucesso     true                    else               pot   array search  format  units 1024               if   is numeric  pot    amp  amp    pot gt  0                     out  pot      pot                   out  base     1024                   out  sucesso     true                                  if  force 1024                out  base     1024                      return  out

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I know it s maybe a little late to answer this question but  more data is not going to kill someone  Here s a very fast function    function format filesize  B   D 2        S    BkMGTPEZY        F   floor  strlen  B  - 1    3       return sprintf      D f    B pow 1024   F         S  F   B       EDIT  I updated my post to include the fix proposed by camomileCase   function format filesize  B   D 2        S    kMGTPEZY        F   floor  strlen  B  - 1    3       return sprintf      D f    B pow 1024   F         S  F-1   B

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Here is simplified implementation of the Drupal format size function          Generates a string representation for the given byte count         param  size      A size in bytes         return      A string representation of the size      function format size  size      if   size  lt  1024        return  size     B         else        size    size   1024       units     KB    MB    GB    TB        foreach   units as  unit          if  round  size  2   gt   1024             size    size   1024                else           break                    return round  size  2           unit

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This is Chris Jester-Young s implementation  cleanest I ve ever seen  combined with php net s and a precision argument   function formatBytes  size   precision   2         base   log  size  1024        suffixes   array      K    M    G    T            return round pow 1024   base - floor  base     precision         suffixes floor  base       echo formatBytes 24962496      23 81M  echo formatBytes 24962496  0      24M  echo formatBytes 24962496  4      23 8061M

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I figured I would add a meshing of two submitters code  Using John Himmelman s code  which is in this thread  and using Eugene Kuzmenko s code  that I m using    function swissConverter  value   format   true   precision   2          Below converts value into bytes depending on input  specify mb  for        example       bytes   preg replace callback     s   d   s      kmgt   b    s   i        function   m            switch  strtolower  m 2                case  t    m 1     1024            case  g    m 1     1024            case  m    m 1     1024            case  k    m 1     1024                    return  m 1               value       if is numeric  bytes             if  format     true                  Below converts bytes into proper formatting  human readable                basically               base   log  bytes  1024                suffixes   array      KB    MB    GB    TB                    return round pow 1024   base - floor  base     precision                               suffixes floor  base              else               return  bytes                  else           return NULL    Change to prefered response           This uses Eugene s code to format the  value into bytes  I keep my data in MB  so it converts my data  10485760 MB into 10995116277760  - it then uses John s code to convert it into the proper display value  10995116277760 into 10 TB     I ve found this really helpful - so my thanks to the two submitters

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Another condensed implementation which can translate to the base 1024  binary  or base 1000  decimal  and also works with incredibly large numbers hence of the use of the bc library   function renderSize  byte  precision 2  mibi true         base    string   mibi 1024 1000        labels   array  K   M   G   T   P   E   Z   Y        for  i 8  i gt  1  i--          if bccomp  byte bcpow  base   i   gt  0              return bcdiv  byte bcpow  base   i    precision       labels  i-1    mibi  iB   B        return  byte   Byte

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function changeType  size   type   end        arr     B    KB    MB    GB    TB         tSayi   array search  type   arr        eSayi   array search  end   arr        pow    eSayi -  tSayi      return  size   pow 1024    pow           end     echo changeType 500   B    KB

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This is Kohana s implementation  you could use it   public static function bytes  bytes   force unit   NULL   format   NULL   si   TRUE           Format string      format     format     NULL      01 2f  s     string   format          IEC prefixes  binary      if   si    FALSE OR strpos  force unit   i       FALSE                 units   array  B    KiB    MiB    GiB    TiB    PiB             mod     1024               SI prefixes  decimal      else                units   array  B    kB    MB    GB    TB    PB             mod     1000                Determine unit to use     if    power   array search  string   force unit   units       FALSE                 power     bytes  gt  0    floor log  bytes   mod     0             return sprintf  format   bytes   pow  mod   power    units  power

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Here is an option using log10   lt  php  function format number float  n   string       n2    int  log10  n    3      return sprintf    3f    n   1e3     n2           k     M     G    n2       s   format number 9012345678   var dump  s     9 012 G     https   php net function log10

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Flexible solution  function size  size  array  options null          o              binary    gt  false           decimalPlaces    gt  2           decimalSeparator    gt                thausandsSeparator    gt               maxThreshold    gt  false     or thresholds key          suffix    gt                 thresholds    gt        K    M    G    T    P    E    Z    Y                 decimal    gt     threshold B                binary    gt     threshold iB                bytes    gt    B                        if   options     null           o   array replace recursive  o   options         base    o  binary     1024   1000       exp    size   floor log  size    log  base     0       if    o  maxThreshold       false   amp  amp            o  maxThreshold    lt   exp                 exp    o  maxThreshold         return   exp            round  size     o  suffix    bytes                            number format                   size   pow  base   exp                    o  decimalPlaces                     o  decimalSeparator                     o  thausandsSeparator                               str replace                    threshold                     o  suffix    thresholds    exp                    o  suffix    o  binary      binary     decimal                               var dump size disk free space            string 8   quot 14 63 GB quot  var dump size disk free space         binary    gt  true        string 9   quot 13 63 GiB quot  var dump size disk free space         maxThreshold    gt  2        string 11   quot 14631 90 MB quot  var dump size disk free space         binary    gt  true   maxThreshold    gt  2        string 12   quot 13954 07 MiB quot

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Just my alternative  short and clean           param int  bytes Number of bytes  eg  25907      param int  precision  optional  Number of digits after the decimal point  eg  1      return string Value converted with unit  eg  25 3KB      function formatBytes  bytes   precision   2         unit     B    KB    MB    GB         exp   floor log  bytes  1024     0      return round  bytes    pow 1024   exp     precision   unit  exp       or  more stupid and efficent   function formatBytes  bytes   precision   2        if   bytes  gt  pow 1024 3   return round  bytes   pow 1024 3    precision   GB       else if   bytes  gt  pow 1024 2   return round  bytes   pow 1024 2    precision   MB       else if   bytes  gt  1024  return round  bytes   1024   precision   KB       else return   bytes   B

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function byte format  size         bytes   array    KB     MB     GB     TB         foreach   bytes as  val            if  1024  lt    size                 size    size   1024              continue                    break            return round   size  1      val

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function formatBytes  bytes   precision   2          units   array  B    KB    MB    GB    TB           bytes   max  bytes  0         pow   floor   bytes   log  bytes    0    log 1024          pow   min  pow  count  units  - 1            Uncomment one of the following alternatives         bytes    pow 1024   pow           bytes     1  lt  lt   10    pow          return round  bytes   precision           units  pow          Taken from php net  there are many other examples there  but I like this one best  -

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function convertToReadableSize  size       base   log  size    log 1024      suffix   array  B    KB    MB    GB    TB       f base   floor  base     return round pow 1024   base - floor  base    1     suffix  f base       Just call the function  echo convertToReadableSize 1024      Outputs  1KB  echo convertToReadableSize 1024   1024      Outputs  1MB

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I developed my own function that convert human readable memory size to different sizes   function convertMemorySize  strval  string  to unit    b          strval      strtolower str replace           strval         val         floatval  strval        to unit     strtolower trim  to unit   0        from unit   str replace  val       strval        from unit   empty  from unit     b    trim  from unit  0        units        kmgtph        k ilobyte   m egabyte   g igabyte and so on             Convert to bytes     if   from unit      b            val    1024     strpos  units   from unit    1            Convert to unit     if   to unit      b            val    1024     strpos  units   to unit    1         return  val      convertMemorySize  1024Kb    Mb        1 convertMemorySize  1024    k           1 convertMemorySize  5 2Mb    b          5452595 2 convertMemorySize  10 kilobytes    bytes      10240 convertMemorySize 2048   k             By default convert from bytes  result is 2   This function accepts any memory size abbreviation like  Megabyte  MB  Mb  mb  m  kilobyte  K  KB  b  Terabyte  T      so it is typo safe

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I succeeded with following function       function format size  size             mod   1024           units   explode      B KB MB GB TB PB            for   i   0   size  gt   mod   i                   size     mod                    return round  size  2           units  i

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My approach      function file format size  bytes   decimals   2       unit list   array  B    KB    MB    GB    PB       if   bytes    0        return  bytes          unit list 0           unit count   count  unit list     for   i    unit count - 1   i  gt   0   i--         power    i   10      if    bytes  gt  gt   power   gt   1        return round  bytes    1  lt  lt   power    decimals           unit list  i

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I don t know why you should make it so complicated as the others   The following code is much simpler to understand and about 25  faster than the other solutions who uses the log function  called the function 20 Mio  times with different parameters   function formatBytes  bytes   precision   2         units     Byte    Kilobyte    Megabyte    Gigabyte    Terabyte         i   0       while  bytes  gt  1024             bytes    1024           i              return round  bytes   precision           units  i

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try this     function bytesToSize  bytes                     sizes     Bytes    KB    MB    GB    TB                    if   bytes    0  return  n a                    i   intval floor log  bytes    log 1024                     if   i    0  return  bytes          sizes  i                    return round   bytes   pow 1024   i   1 PHP ROUND HALF UP          sizes  i                 echo bytesToSize 10000050300

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Just divide it by 1024 for kb  1024 2 for mb and 1024 3 for GB  As simple as that

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Pseudocode    base   log  size    log 1024    suffix   array      k    M    G    T   floor  base    return pow 1024   base - floor  base      suffix

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Simple function  function formatBytes  size   precision   0        unit     Byte   KiB   MiB   GiB   TiB   PiB   EiB   ZiB   YiB         for  i   0   size  gt   1024  amp  amp   i  lt  count  unit -1   i              size    1024             return round  size   precision       unit  i      echo formatBytes  1876144   2     returns 1 79 MiB

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This work with the last PHP  function formatBytes  bytes   precision   2          units   array  B    KB    MB    GB    TB           bytes   max  bytes  0         pow   floor   bytes   log  bytes    0    log 1024          pow   min  pow  count  units  - 1          bytes    pow 1024   pow         return round  bytes   precision           units  pow

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Albeit a bit stale  this library offers a tested and robust conversion API   https   github com gabrielelana byte-units  Once installed    ByteUnits Binary  bytes 1024 - gt format        Output   1 00KiB    And to convert in the other direction    ByteUnits Binary  parse  1KiB  - gt numberOfBytes        Output   1024    Beyond basic conversion  it offers methods for addition  subtraction  comparison  etc   I am no way affiliated with this library

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It s a little late but a slightly faster version of the accepted answer is below   function formatBytes  bytes   precision         unit list   array                B            KB            MB            GB            TB                bytes   max  bytes  0        index   floor log  bytes  2    10        index   min  index  count  unit list  - 1        bytes    pow 1024   index        return round  bytes   precision           unit list  index       It s more efficient  due to performing a single log-2 operation instead of two log-e operations   It s actually faster to do the more obvious solution below  however   function formatBytes  bytes   precision         unit list   array                B            KB            MB            GB            TB                index max   count  unit list  - 1       bytes   max  bytes  0        for   index   0   bytes  gt   1024  amp  amp   index  lt   index max   index                   bytes    1024             return round  bytes   precision           unit list  index       This is because as the index is calculated at the same time as the value of the number of bytes in the appropriate unit  This cut the execution time by about 35   a 55  speed increase

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use this function if you want a short code  bcdiv     size   11485760  echo bcdiv  size  1048576  0      return  10  echo bcdiv  size  1048576  2      return  10 9  echo bcdiv  size  1048576  2      return  10 95  echo bcdiv  size  1048576  3      return  10 953

[php] Format bytes to kilobytes, megabytes, gigabytes

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