Here, I'm trying to swap the number using PHP but not able to swap. How to solve that problem.
My Code :
<?php
$a = 45;
$b = 78;
echo "Before swapping:<br><br>";
echo "a =".$a." b=".$b;
echo "<br/><br/>";
// Swapping Logic
$a=$a $b;
$b=$a-$b;
$a=$a $b;
echo "After swapping:<br><br>";
echo "a =".$a." b=".$b;
?>
I'm a beginner in php just learning about logic but getting exception so any body can help how to solve it?
CodePudding user response：
Please replace your code
// Swapping Logic
$a=$a $b;
$b=$a-$b;
$a=$a $b;
with
$a=$a $b;
$b=$a-$b;
$a=$a-$b;
CodePudding user response：
You can also swap the variables this way:
list($a, $b) = array($b, $a);
CodePudding user response：
You can just minus it with the one u added or you can try creating another variable to temporarily store the other value while you swap. storing it on a temporary variable is how people usually do it as if you have done leet code , the bubble sort is a good practice for this kind of logic.
$a=$a $b;
$b=$a-$b;
$a=$a-$b;
// Swapping Logic
$third = $a;
$a = $b;
$b = $third;
CodePudding user response：
You can dereference in arrays in one line:
<?php
$a = 1;
$b = 2;
[$b,$a] = [$a,$b];
echo $a,' ', $b; // 2 1
Works as far back as PHP 7.1.0