Is it safe to use xor for variable swapping in PHP
Is it safe to use this kind of variable swapp开发者_开发技巧ing in php ?
$a^=$b^=$a^=$b;
No, because the variables may not be types that can be XORd the way you expect. The PHP idiom for swapping two variables (of any scalar type) in one line is:
list($a, $b) = array($b, $a);
Only correct when both are integer. It's readability is poor,and efficiency is not good too,why use it?
精彩评论