note 120940 added to function.array-filter

If you like me have some trouble understanding example #1 due to the bitwise operator (&) used, here is an explanation. The part in question is this callback function: <?php function odd($var) { // returns whether the input integer is odd return($var & 1); } ?> If given an integer this function returns the integer 1 if $var is odd and the integer 0 if $var is even. The single ampersand, &, is the bitwise AND operator. The way it works is that it takes the binary representation of the two arguments and compare them bit for bit using AND. If $var = 45, then since 45 in binary is 101101 the operation looks like this: 45 in binary: 101101 1 in binary: 000001 ------ result: 000001 Only if the last bit in the binary representation of $var is changed to zero (meaning that the value is even) will the result change to 000000, which is the representation of zero. ---- Server IP: 72.52.91.14 Probable Submitter: 130.225.33.167 ---- Manual Page -- http://php.net/manual/en/function.array-filter.php Edit -- https://master.php.net/note/edit/120940 Del: integrated -- https://master.php.net/note/delete/120940/integrated Del: useless -- https://master.php.net/note/delete/120940/useless Del: bad code -- https://master.php.net/note/delete/120940/bad+code Del: spam -- https://master.php.net/note/delete/120940/spam Del: non-english -- https://master.php.net/note/delete/120940/non-english Del: in docs -- https://master.php.net/note/delete/120940/in+docs Del: other reasons-- https://master.php.net/note/delete/120940 Reject -- https://master.php.net/note/reject/120940 Search -- https://master.php.net/manage/user-notes.php