Question

Exchange the value of $a=20 & $b=30 this variables without creating any new variable ?

$a=20;$b=30;

Answer 1

You can create logic like this

b=a+b (50)

a=b-a (50-20=30)

b=b-a (50-30=20)

'

$b=$a+$b;
$a=$b-$a;
$b=$b-$a;

'

Comments

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