Created
February 23, 2012 03:17
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decToBits()
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php > var_dump(PHP_INT_MAX); | |
int(9223372036854775807) | |
php > var_dump(decbin(PHP_INT_MAX)); | |
string(63) "111111111111111111111111111111111111111111111111111111111111111" | |
php > var_dump(-1 * PHP_INT_MAX); | |
int(-9223372036854775807) | |
php > var_dump(decbin(-1 * PHP_INT_MAX)); | |
string(64) "1000000000000000000000000000000000000000000000000000000000000001" | |
php > var_dump(decbin(-1)); | |
string(64) "1111111111111111111111111111111111111111111111111111111111111111" | |
php > var_dump(decbin(-2)); | |
string(64) "1111111111111111111111111111111111111111111111111111111111111110" | |
php > var_dump(decbin(-4)); | |
string(64) "1111111111111111111111111111111111111111111111111111111111111100" | |
php > var_dump(decbin(-8)); | |
string(64) "1111111111111111111111111111111111111111111111111111111111111000" | |
php > var_dump(decbin(-16)); | |
string(64) "1111111111111111111111111111111111111111111111111111111111110000" |
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>_< (suinair:~/Desktop) | |
* php test.php | |
string(64) "1111111111111111111111111111111111111111111111111111111111111111" | |
Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 71 bytes) in /Users/suin/Desktop/test.php on line 13 |
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<?php | |
function decToBits($dec) | |
{ | |
var_dump(decbin($dec)); | |
$bits = array(); | |
for ( $i = 0; $dec; $dec >>= 1, $i += 1 ) | |
{ | |
if ( $dec & 0x01 ) | |
{ | |
$bits[] = pow(2, $i); | |
} | |
} | |
return $bits; | |
} | |
var_dump(decToBits(-1)); |
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