同时兼容32位与64位机器的phphash函数_PHP教程

if (exec("getconf LONG_BIT") == "32") {
 function _hash($apszData = "", $MAX_TABLE_NUM = 0) {
  $_hash = $x = $i = 0;
  for($i = 0; $i < strlen($apszData); $i++) {
   $_hash = ($_hash << 4) + ord($apszData[$i]);
   if (($x = $_hash &0xF0000000) != 0) {
    $_hash ^= ($x >> 24);
    $_hash &= ~$x;
   }
  }
  return ($_hash &0x7FFFFFFF) % $MAX_TABLE_NUM + 1;
 }
} else {
 function _hash($apszData = "", $MAX_TABLE_NUM = 0) {
  $hash = $x = $i = 0;
  for($i = 0; $i < strlen($apszData); $i++) {
   $hash = ($hash << 4) + ((ord($apszData[$i])) << 32);
 
   if (($x = $hash &0xF000000000000000) != 0) {
    $hash ^= $x >> 24;
    $hash &= (~$x) &0xFFFFFFFF00000000;
   }
  }
 
  $ret = ($hash &0x7FFFFFFF00000000) % ($MAX_TABLE_NUM << 32) + (1 << 32);
  $ret >>= 32;
  $ret &= 0xFFFFFFFF;
  return $ret;
 }
}

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