Php redis extended interger overflow -

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why? guess overflow,but can't fix it.

<?php /*redis*/ $redis = new redis(); $redis->connect('127.0.0.1'); $res = $redis->eval('return   32140378*16777216'); var_dump($res); exit; //result：1509949440 //right：539226064027648

i have repaired myself, more details: https://github.com/phpredis/phpredis/pull/721


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