Question

How to swap the first 4 bits of a number with the last 4 bits in PHP

Answer 1

function print_bits($n) {
    for ($i = 7; $i >= 0; $i--) {
        echo ($n >> $i) & 1;
    }
    echo "<br />";
}
 
$n = 92; 
  
print_bits($n);
  
$n = (($n & 0xf0) >> 4) | (($n & 0x0f) << 4);
      
print_bits($n);
  


  
/*
run:
       
01011100
11000101
      
*/

 

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