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A 64 bit integer for PHP
thegeek misses a 64 bit integer for PHP (German), since he uses a bitmask with more then 32 options. Here's a proposal, how to deal with this problem by splitting a float into two integers:
<?php
define("BIGINT_DIVIDER", 0x7fffffff + 1);
function split2Int(&$upper, &$lower, $value) {
$lower = intval($value % BIGINT_DIVIDER);
$upper = intval(($value - $lower) / BIGINT_DIVIDER);
}
function bigInt2float($upper, $lower) {
return $upper * BIGINT_DIVIDER + $lower;
}
?>split2Int puts the upper 32 bits into $upper and the lower 32 bits into $lower. Binary operations can now be performed on both the ints. Afterwards, the result in converted to a float using bigInt2float(). I also wrapped up this stuff into a little class. You can download it here.
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Another solution is the bigint pecl package:
http://pecl.php.net/package/big_int