note 69771 added to language.operators.bitwise

<?php function xor_swap(&$a, &$b) { if($a==$b) { return; } $c = $a ^ $b; $b = $c ^ $b; $a = $c ^ $a; } ?> Explanation: $c=$a*^$b*; $b=$c^$b*; => $b=($a*^$b*)^$b*; => $b=$a*^0; => $b=$a*; $a=$c^$a*; => $a=($a*^$b*)^$a; => $a=$b*^0; =>$a=$b*; *original value of the variable Now a version of xor_swap() with no buffer ($c): <?php function xor_swap(&$a,&$b){ if($a==$b) { return; } $a=$a^$b; $b=$a^$b; $a=$a^$b; } ?> Explanation: $a=$a*^$b*; $b=$a^$b*; => $b=($a*^$b*)^$b*; => $b=$a*; $a=$a^$b; => $a=($a*^$b*)^$a*; =>$a=$b*; * original value of the variable ---- Server IP: 216.235.15.211 Probable Submitter: 206.126.85.79 ---- Manual Page -- http://www.php.net/manual/en/language.operators.bitwise.php Edit -- https://master.php.net/note/edit/69771 Del: integrated -- https://master.php.net/note/delete/69771/integrated Del: useless -- https://master.php.net/note/delete/69771/useless Del: bad code -- https://master.php.net/note/delete/69771/bad+code Del: spam -- https://master.php.net/note/delete/69771/spam Del: non-english -- https://master.php.net/note/delete/69771/non-english Del: in docs -- https://master.php.net/note/delete/69771/in+docs Del: other reasons-- https://master.php.net/note/delete/69771 Reject -- https://master.php.net/note/reject/69771 Search -- https://master.php.net/manage/user-notes.php