if statements

[filburt1]

In PHP when if statements are evaluated, is every condition checked before returning the final value, or as soon as the condition has no choice but to be false does it return?

For example, let's say I do this:

if ($a == 1 || $b == 1)

Now assume $a is 1. That means that regardless of the value of $b the condition will evalutate to true. Will PHP still check the value of $b and then return, or just return when it knows that there's no other possible outcome?

[filburt1]

Never mind:

lexzeus at mifinca dot com
08-Nov-2000 11:14

function lex1()
{
print "Hello";
return 1;
}
function lex2()
{
print "World";
return 1;
}
if (lex1() || lex2()) {}

it only print "Hello", so lex2() never been executed.

So, u can also write :

if (
@function1() &&
@function2() &&
@function3() &&
@function4() &&
@function5()) {}

It will do

[mjr]

no, it never checks conditions, which are unnecessary

[leonleun]

php short-circuits its conditional statements, meaning that if a statements if evaluated to be either true or false and the remaining statements will not effect the outcome, then they will not be tested.

[filburt1]

Great 🙂