What does do..WHILE(0); mean?

janhouse00

As stated in the subject line. Thank you very much.

killerbishop

It's actually a useless statement. I pity the programmer that wrote that. Basically,

do {

   echo "hello world";

} while(0);

is the same as:

echo "hello world";

The reason is that while(0) will never be true, but the code block will execute at least once.

janhouse00

Oh thanks killerbishop, how kind of you 🙂

Weedpacket

...unless the {} block contains a break; statement, in which case the whole do...while thing is just a seriously tacky and unfroody method the programmer used to jump over some code.

do{
//....section A
if(condition) break;
//....section B
}while (0);
//....section C

if(condition) is true, then PHP will jump over section B and continue on with section C.

Very nasty.