Is it safe to use this kind of variable swapping in php ?
$a^=$b^=$a^=$b;
+6
A:
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);
gregjor
2010-10-16 10:24:00
+1 But that should work for any types, not only scalars.
nikic
2010-10-16 10:42:29
Yes it does... I wasn't sure list() worked with arrays but I tried it and it does work.
gregjor
2010-10-16 10:47:34
A:
Only correct when both are integer. It's readability is poor,and efficiency is not good too,why use it?
matthewyang
2010-10-16 10:26:30