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
- 14 Answers
- 34992 Views
- Aquasol, Infosys, TCS, Torque Infotech, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / binoyav
$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 ? | 79 Yes | 6 No |
Answer / vivek srivastava
<?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 ? | 31 Yes | 8 No |
Answer / ranjan
function swap(){
$a = 10;
$b = 20;
$a = $a + $b;
$b = $a - $b;
$a = $a - $b;
echo $a, $b;
}
| Is This Answer Correct ? | 44 Yes | 25 No |
Answer / ankush sharma
<?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 ? | 14 Yes | 2 No |
Answer / ramse
yes we can do this also.
But pass by reference allow in PHP5 not in PHP4.
| Is This Answer Correct ? | 8 Yes | 0 No |
Answer / sunil kumar
<?php
$a = 10;
$b = 20;
echo $a, $b;
$a=$a+$b;
$b=$a-$b;
$a=$a-$b;
echo "<br>";
echo $a, $b;
?>
| Is This Answer Correct ? | 9 Yes | 2 No |
Answer / naresh
$a=10;
$b=10;
list($a,$b) = array($b, $a);
echo "a=" . $a;
echo "b=" . $b;
| Is This Answer Correct ? | 7 Yes | 1 No |
Answer / dinesh kumar
function swap($x,$y)
{
$x^=$y^=$x^=$y;
return array($x,$y);
}
list($a,$b)=swap(5,10);
echo $a;
echo $b;
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / binoyav
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 ? | 8 Yes | 7 No |
how to store date to database
Explain what does the expression exception::__tostring means?
What is a simple php method to make a cross domain data request?
How do you achieve page caching in PHP?
Which is the best method to fetch the data from mysql? 1.mysql_fetch_array() 2.mysql_fetch_object() 3.mysql_fetch_row() 4.mysql_fetch_assoc()
What are php string functions?
write a note on Testing the web site
What is .htaccessfile and use of this file
what is the best function that can be used to connect to mysql database and in what cases that we can use below functions ? 1. mysql_connect() 2. mysql_pconnect() please give your answer with all pros and cons
How can you create a session in php?
Is facebook still in php?
What is the use of inner join in mysql?
PHP 
