php怎么把一个整数拆成高4位低4位。8bytes的数组？？？

[z109876543210]

php怎么把一个整数拆成高4位低4位。8bytes的数组？？？

[xuzuning]

高4位低4位 是什么意思？ 难道是这样？

$n = 1234567;
$a = unpack('C*', pack('l', $n));
foreach($a as $v) {
  $r[] = ($v % 0xf0) >> 4;
  $r[] = $v % 0x0f;
}
print_r($r);

Array
(
    [0] => 8
    [1] => 0
    [2] => 13
    [3] => 4
    [4] => 1
    [5] => 3
    [6] => 0
    [7] => 0
)

[z109876543210]

java的代码是这样的 1234567 & 0x80 1234567 & (1<<16) 1234567 & (1<<5) 1234567 & (1<<4) 1234567 & (1<<3) 1234567 & (1<<8)

[傲雪星枫]

$n = 100;
$b = decbin($n);
$s = (string)$b;

echo '高位:'.substr($s,0,-4).PHP_EOL;
echo '低位:'.substr($s,-4).PHP_EOL;

[xuzuning]

那直译就是了

$n = 1234567;
$r[] = $n & 0x80;
$r[] = $n & (1<<16);
$r[] = $n & (1<<5);
$r[] = $n & (1<<4);
$r[] = $n & (1<<3);
$r[] = $n & (1<<8);
print_r($r);

Array
(
    [0] => 128
    [1] => 0
    [2] => 0
    [3] => 0
    [4] => 0
    [5] => 0
)