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Question 
1. Write a function to swap two values ?
$a = 10;
$b = 20;
echo $a, $b;
swap(); // If u want u can pass parameters
echo $a, $b; // It should print 20 , 10
 Question Submitted By :: Binoyav
I also faced this Question!!     Rank Answer Posted By  
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 1		 
function swap(){

$a = 10;
$b = 20;

$a = $a + $b;
$b = $a - $b;
$a = $a - $b;
echo $a, $b;

}
 
Is This Answer Correct ?    1 Yes 1 No
Ranjan
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 2		 
The above answer is correct. But the interviewer does not
want to echo the values from inside the function. It should
be in the following way
$a = 10;
$b = 20;
echo $a, $b;
swap(); // Here if you want you can pass the variables
echo $a, $b;

function swap()
{
}
 
Is This Answer Correct ?    1 Yes 0 No
Binoyav
 
 
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 3		 
$a = 10;
	$b = 20;
	
	echo $a, $b;
	echo "<br>";
	swap($a, $b);
	echo $a, $b;
	function swap(&$a, &$b)
	{
		$temp = $a;
		$a = $b;
		$b = $temp;
	}
 
Is This Answer Correct ?    7 Yes 0 No
Binoyav
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 4		 
One way is:

function swap($x, $y) {
    $x ^= $y ^= $x ^= $y;
    return array($x,$y);
}
 
Is This Answer Correct ?    1 Yes 0 No
Ramse
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 5		 
<?php
$a=10;
$b=20;
echo $a,$b;
echo "<br>";
swap($a, $b);
echo "<br>";
echo $a,$b;
function swap(&$a, &$b)
{
  $a = $a + $b;
  $b = $a - $b;
  $a = $a - $b;
}
?>
 
Is This Answer Correct ?    4 Yes 0 No
Vivek Srivastava
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 6		 
yes we can do this also.
But pass by reference allow in PHP5 not in PHP4.
 
Is This Answer Correct ?    1 Yes 0 No
Ramse
 
  Re: 1. Write a function to swap two values ? $a = 10; $b = 20; echo $a, $b; swap(); // If u want u can pass parameters echo $a, $b; // It should print 20 , 10
Answer
# 7		 
$x=$a;
$a=$b;
$b=$x;
echo $a.",".$b;
 
Is This Answer Correct ?    0 Yes 0 No
Nikunj Kansara
 

 
 
 
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