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Filename : murmurhash3.php
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<?php

/**
 * PHP Implementation of MurmurHash3
 *
 * @author Stefano Azzolini (lastguest@gmail.com)
 * @see https://github.com/lastguest/murmurhash-php
 * @author Gary Court (gary.court@gmail.com)
 * @see http://github.com/garycourt/murmurhash-js
 * @author Austin Appleby (aappleby@gmail.com)
 * @see http://sites.google.com/site/murmurhash/
 *
 * @param  string $key   Text to hash.
 * @param  number $seed  Positive integer only
 * @return number 32-bit (base 32 converted) positive integer hash
 */

function murmurhash3_int($key,$seed=0){
  $key  = array_values(unpack('C*',(string) $key));
  $klen = count($key);
  $h1   = (int)$seed;
  for ($i=0,$bytes=$klen-($remainder=$klen&3) ; $i<$bytes ; ) {
    $k1 = $key[$i]
      | ($key[++$i] << 8)
      | ($key[++$i] << 16)
      | ($key[++$i] << 24);
    ++$i;
    $k1  = (((($k1 & 0xffff) * 0xcc9e2d51) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0xcc9e2d51) & 0xffff) << 16))) & 0xffffffff;
    $k1  = $k1 << 15 | ($k1 >= 0 ? $k1 >> 17 : (($k1 & 0x7fffffff) >> 17) | 0x4000);
    $k1  = (((($k1 & 0xffff) * 0x1b873593) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0x1b873593) & 0xffff) << 16))) & 0xffffffff;
    $h1 ^= $k1;
    $h1  = $h1 << 13 | ($h1 >= 0 ? $h1 >> 19 : (($h1 & 0x7fffffff) >> 19) | 0x1000);
    $h1b = (((($h1 & 0xffff) * 5) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 5) & 0xffff) << 16))) & 0xffffffff;
    $h1  = ((($h1b & 0xffff) + 0x6b64) + ((((($h1b >= 0 ? $h1b >> 16 : (($h1b & 0x7fffffff) >> 16) | 0x8000)) + 0xe654) & 0xffff) << 16));
  }
  $k1 = 0;
  switch ($remainder) {
    case 3: $k1 ^= $key[$i + 2] << 16;
    case 2: $k1 ^= $key[$i + 1] << 8;
    case 1: $k1 ^= $key[$i];
    $k1  = ((($k1 & 0xffff) * 0xcc9e2d51) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0xcc9e2d51) & 0xffff) << 16)) & 0xffffffff;
    $k1  = $k1 << 15 | ($k1 >= 0 ? $k1 >> 17 : (($k1 & 0x7fffffff) >> 17) | 0x4000);
    $k1  = ((($k1 & 0xffff) * 0x1b873593) + ((((($k1 >= 0 ? $k1 >> 16 : (($k1 & 0x7fffffff) >> 16) | 0x8000)) * 0x1b873593) & 0xffff) << 16)) & 0xffffffff;
    $h1 ^= $k1;
  }
  $h1 ^= $klen;
  $h1 ^= ($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000);
  $h1  = ((($h1 & 0xffff) * 0x85ebca6b) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 0x85ebca6b) & 0xffff) << 16)) & 0xffffffff;
  $h1 ^= ($h1 >= 0 ? $h1 >> 13 : (($h1 & 0x7fffffff) >> 13) | 0x40000);
  $h1  = (((($h1 & 0xffff) * 0xc2b2ae35) + ((((($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000)) * 0xc2b2ae35) & 0xffff) << 16))) & 0xffffffff;
  $h1 ^= ($h1 >= 0 ? $h1 >> 16 : (($h1 & 0x7fffffff) >> 16) | 0x8000);
  return $h1;
}

function murmurhash3($key,$seed=0){
  return base_convert(murmurhash3_int($key,$seed),10,32);
}