For example:
$result = func(14);
The $result should be:
array(1,1,1,0)
How to implement this func?
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5 Answers
decbin would produce a string binary string:
echo decbin(14); # outputs "1110"
array_map('intval', str_split(decbin(14))) # acomplishes the full conversion
Comments
function func($number) {
return str_split(decbin($number));
}
Comments
<?php
function int_to_bitarray($int)
{
if (!is_int($int))
{
throw new Exception("Not integer");
}
return str_split(decbin($int));
}
$result = int_to_bitarray(14);
print_r($result);
Output:
Array
(
[0] => 1
[1] => 1
[2] => 1
[3] => 0
)
Comments
You can go on dividing it by 2 and store remainder in reverse...
number=14
14%2 = 0 number=14/2= 7
7%2 = 1 number=7/2 = 3
3%2 = 1 number=3/2 = 1
1%2 = 1 number=1/2 = 0
Comments
for($i = 4; $i > 0; $i++){
array[4-$i] = (int)($x / pow(2,$i);
$x -= (int)($x / pow(2,$i);
}
...this would do the trick. Before that you could check how big the array needs to be and with which value of $i to start.
