Top 10 PHP Programming/ Logical Interview questions and answers

Online Learn Top 10 PHP Programming/ Logical Interview questions and answers :

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Write a program for following output?

* * * * *

* * * *

* * *

* *

*

Answer –

<?php

for($k=0;$k<=5;$k++){

for($m=5-$i;$m>=1;$m–){

echo “* ”;

}

echo “<br>”;

}

?>

Write a program for following output?

*

* *

* * *

* * * *

* * * * *

Answer-

<?php

for($i=0;$i<=5;$i++){

for($j=1;$j<=$i;$j++){

echo “* ”;

}

echo “<br>”;

}

?>

Write a program for following output?

*

* *

* * *

* * * *

* * * * *

* * * * * *

* * * * *

* * * *

* * *

* *

*

Answres-

<?php

for($i=0;$i<=6;$i++){

for($k=6;$k>=$i;$k–){

echo ” ”;

}

for($j=1;$j<=$i;$j++){

echo “* ”;

}

echo “<br>”;

}

for($i=5;$i>=1;$i–){

for($k=6;$k>=$i;$k–){

echo ” ”;

}

for($j=1;$j<=$i;$j++){

echo “* ”;

}

echo “<br>”;

}

?>

Write a program for following output?

*****

*****

*****

*****

*****

Answer-

<?php

for ($c=1; $c<=5; $c++)

{

for($c=1; $c<=5; $c++)

{

echo “*”;

}

echo “<br>”;

}

?>

Find a factorial of a given number ?

Answer-

<?php

if(isset($_POST[‘submit’]))

{

$number = $_POST[‘num’]; /*number to get factorial */

$fact = 1;

for($k=1;$k<=$number;++$k)

{

$fact = $fact*$k;

}

echo “Factorial of $number is “.$fact;

}

?>

Find number whether a prime or not ?

Answer-

<?php

if(isset($_POST[‘submit’]))

{

$check=0;

$num=$_POST[‘num’];

for($i=2;$i<=($num/2);$i++)

{

if($num%$i==0)

{

$check++;

if($check==1)

{

break ;

}

}

}

if($check==0)

{

echo “It is a Prime Number”;

}

else

{

echo “It is not a Prime Number”;

}

}

?>

Find number whether armstrong or not ?

Answer- An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to number .

For example, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371.

<?php

if(isset($_POST[‘submit’]))

{

$number = $_POST[‘num’]; // get the number entered by user

$temp = $number;

$sum = 0;

while($temp != 0 )

{

$remainder = $temp % 10; //find reminder

$sum = $sum + ( $remainder * $remainder * $remainder );

$temp = $temp / 10;

}

if( $number == $sum )

{

echo “$number is an Armstrong Number”;

}else

{

echo “$number is not an Armstrong Number”;

}

}

?>

Find year whether leap year or not ?

Answer-

<?php

if(isset($_POST[‘submit’]))

{

$year=$_POST[‘year’];

if($year%4==0)

{

echo “It is a leap year”;

}

else

{

echo “It is not a leap year”;

}

}

?>

Write a program for this following output ?

1

22

333

4444

55555

Answer-

<html>

<head>

<title>Number Pyramid</title>

</head>

<body>

<?php

$r;

$c;

for($r=1;$r<=5;$r++)

{

for($c=1;$c<=$r;$c++)

{

print(“$r”);

}

print “<br>”;

}

?>

</body>

</html>

Print a given number reverse ?

Answer –

<?php

if(isset($_POST[‘submit’]))

{

$rev=0;

$num=$_POST[‘num’];

while($num>=1)

{

$re=$num%10;

$rev=$rev*10+$re;

$num=$num/10;

}

echo “Reverse number of is ” .$rev;

}

?>

Swap two given values without helping from third variable ?

Answer –

<?php

if(isset($_POST[‘submit’]))

{

$value1=$_POST[‘num1’];

$value2=$_POST[‘num2’];

$value1=$value1+$value2;

$value2=$value1-$value2;

$value1=$value1-$value2;

echo “Value of first variable after swapping” .$value1.”<br />”;

echo “Value of second variable after swapping” .$value2;

}

?>

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