PHP hash function compatible with both 32-bit and 64-bit machines_PHP tutorial

Times are progressing and society is developing. The emergence of 64-bit machines has caused the shift calculation to no longer easily overflow. This is certainly a happy thing. However, during the system migration, 64-bit machines were suddenly discovered. The result obtained by the hash function was actually different from the 32-bit result. I was shocked and quickly studied the algorithm and found that it was a problem with the shift operation sign.
I had no choice but to judge the system and rewrite the algorithm for 64-bit machines. The code is as follows:

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;
 }
}

http://www.bkjia.com/PHPjc/735127.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/735127.htmlTechArticleThe times are progressing and society is developing. The emergence of 64-bit computers has caused the shift calculation to no longer easily overflow. This is certainly something to be happy about, but during the system migration, I suddenly discovered a 64-bit machine...