swapping of two variables's value in php

swapping of two variables's value in php

<?php

$a=7;
$b=9;
list($a,$b)=array($b,$a);
print $a;
print $b;

?>


Alternate:

<?php
$a=7;
$b=9;
$a=$a+$b; //$a= 7+9 = 16
$b=$a-$b;  //$b= 16-9 = 7
$a=$a-$b;   //$a=  16-




?>