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$array_variable = NULL;
for($x=0;$x<10;$x++){
$array_variable .= pow(2,$x) . ",";
}
$array = explode(",",$array_variable);
Try this:
for($x=1;$x<=512;$x++)
if(intval(sqrt($x))==sqrt(
echo "$x is a power of 2<br />";
this outputs:
1 is a power of 2
4 is a power of 2
9 is a power of 2
16 is a power of 2
25 is a power of 2
36 is a power of 2
49 is a power of 2
64 is a power of 2
81 is a power of 2
100 is a power of 2
121 is a power of 2
144 is a power of 2
169 is a power of 2
196 is a power of 2
225 is a power of 2
256 is a power of 2
289 is a power of 2
324 is a power of 2
361 is a power of 2
400 is a power of 2
441 is a power of 2
484 is a power of 2
Now if you want to know if 2^x = (array) that's a different thing altogether (this will find values like 512, 256, etc) ill get you the code in a sec