3v4l.org

run code in 300+ PHP versions simultaneously

@ 2015-05-27T00:55:26Z

<?php

/**
 * Since integers in 32-bit PHP 5.x are signed, exclusively, this only goes up to 2147483647
 */
function add_32bit($intA, $intB)
{
    if (!is_int($intA) || !is_int($intB)) {
        return false;
    }
    if ($intA > 2147483647 || $intB > 2147483647) {
        return false;
    }
    $sum = 0;
    $carry = 0;
    $rem = 0;

    for ($i = 0; $i < 4; ++$i) {
        $oA = $intA >> ($i * 8);
        $oB = $intB >> ($i * 8);
        $pA = $oA & 0xff;
        $pB = $oB & 0xff;

        $tmp = ($pA + $pB + $carry);
        $rem = $tmp & 0xff;
        $carry = ($tmp - $rem) >> 8;
        $inc = ($rem << ($i * 8));
        $sum |= $inc & 0x7fffffff;
    }
    return $sum;
}

// Tests
var_dump( add_32bit(1000, 1001) );
var_dump( add_32bit(1000, 2000) );
var_dump( add_32bit(1, 1) );
var_dump( add_32bit(10000000, 10000000) );
var_dump( 2147483646, 1 );
var_dump( 2147483646, 2 );
var_dump( 2147483646, 3 );
var_dump( 2147483646, 4 );

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: int(2001) int(3000) int(2) int(20000000) int(2147483646) int(1) int(2147483646) int(2) int(2147483646) int(3) int(2147483646) int(4)
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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