Question

How to print the bits of a number in PHP

Answer 1

function print_bits($n) {
    for ($i = 31; $i >= 0; $i--) {
        echo ($n >> $i) & 1;
    }
    echo "<br />";
}

$n = 1358;

print_bits($n);



/*
run:
     
00000000000000000000010101001110
    
*/

 

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Answer 2

echo decbin(3) . "\n";
 
echo decbin(10) . "\n"; 
 
echo decbin(15) . "\n"; 
 
echo decbin(180) . "\n"; 
 
echo decbin(255); 
 
 
 
  
/*
run:
  
11
1010
1111
10110100
11111111
  
*/

 

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Answer 3

function get_bits($n, $len = 8) {
    return str_pad(decbin($n), $len, "0", STR_PAD_LEFT);
}
      
      
echo get_bits(3) . "\n";
  
echo get_bits(10) . "\n"; 
  
echo get_bits(15) . "\n"; 
  
echo get_bits(180) . "\n"; 
  
echo get_bits(255); 
  
  
  
/*
run:
 
00000011
00001010
00001111
10110100
11111111
 
*/

 

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