Checking if your code is running on 64-bit PHP

Check the PHP_INT_SIZE constant. It'll vary based on the size of the register (i.e. 32-bit vs 64-bit).

<?php echo $_SERVER['HTTP_USER_AGENT']; ?>

it is contained in the variable, you could explode that and derive it from that

<?php
switch(PHP_INT_SIZE) {case 4:echo '32-bit version of PHP';break;case 8:echo '64-bit version of PHP';break;default:echo 'PHP_INT_SIZE is ' . PHP_INT_SIZE;break;
}

This code snippet will at-least tell you if a 32/64 bit version of PHP is running.

来源： http://stackoverflow.com/questions/6303241/find-windows-32-or-64-bit-using-php

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