PHP Programming Questions
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Write a program to print Factorial of any number
See Answer
<?php
$number = 6; /*number to get factorial */
$fact = 1;
for($k=1;$k<=$number;++$k)
{
$fact = $fact*$k;
}
echo "Factorial of $number is ".$fact;
?>
Write a program in PHP to print Fibonacci series .
0, 1, 1, 2, 3, 5, 8, 13, 21, 34
See Answer
<?PHP
$first = 0;
$second = 1;
echo $first.' ,';
echo $second.' ,';
for($limit=0;$limit<10;$limit++)
{
$third = $first+$second;
echo $third.' ,';;
$first = $second;
$second = $third;
}
?>
Write a program to find whether a number is Armstrong or not
See Answer
// If the sum of cubes of individual digits of a number is equal to the number itslef then it is called Armstrong Number.
<?php
if(isset($_POST['number']) && $_POST['number']!='')
{
$number = $_POST[ 'number' ]; // 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 "$number is not an Armstrong Number";
}
}
?>
Write a program to print Reverse of any number
See Answer
<?php
if(isset($_POST['rev2']))
{
$rev=0;
$num=$_POST['rev'];
while($num>=1)
{
$re=$num%10;
$rev=$rev*10+$re;
$num=$num/10;
}
}
?>
<html>
<head>
<title>Reverse</title>
</head>
<body>
<table>
<form name="frm" method="post">
<tr><td>Number</td><td><input type="text" name="rev"></td></tr>
<tr><td>Reverse is:</td><td><input type="text" value="<?php if(isset($_POST['rev2'])){echo $rev;} ?>" name="rev1"></td></tr>
<tr><td> </td><td><input type="Submit" value="Reverse" name="rev2"></td></tr>
</form>
</table>
</body>
</html>
To check whether a number is Prime or not.
See Answer
<?php
if(isset($_POST['submit']) && $_POST['submit']=='Check' )
{
$check=0;
$num=$_POST['number'];
for($i=2;$i<=($num/2);$i++)
{
if($num%$i==0)
{
$check++;
if($check==1)
{
break;
}
}
}
}
?>
<html>
<head>
<title>Prime Number</title>
</head>
<body>
<table>
<form name="frm" method="post" action="">
<tr><td>Number:</td><td><input type="text" name="number" /></td></tr>
<tr><td></td><td><input type="submit" name="submit" value="Check" /></td>
<td>
<center><span>
<?php if(isset($_POST['sub']))
{if($check==0)
{echo "It is a Prime Number";
}
else
{
echo "It is not a Prime Number";}
}
?>
</span>
</center>
</td>
</tr>
</form>
</table>
</body>
</html>
Write a program to print Fibonacci series
See Answer
<?php if(isset($_POST['sub']))
{ $fibo=array(0,1);
$num=$_POST['nm1'];
for($i=2;$i<=$num-1;$i++)
{
$fibo[$i]=$fibo[$i-1]+$fibo[$i-2];
}
}
?>
<html>
<head>
<title>Fibonacci Series</title>
</head>
<body>
<table>
<form name="frm" method="post" action="">
<tr><td>Number of Terms:</td><td><input type="text" name="nm1" /></td></tr>
<tr><td></td><td><input type="submit" name="sub" /></td>
<td><center><span>
<?php if(isset($_POST['sub'])){
for($i=0;$i<=$num-1;$i++){echo $fibo[$i].",";}
}
?>
</span></center>
</td></tr>
</form>
</table>
</body>
</html>
Write a program to find HCF of two numbers
See Answer
<?php if(isset($_POST['submit']))
{
$num1=$_POST['number1'];
$num2=$_POST['number2'];
function hcf($i1,$i2)
{
if($i2!=0)
{
return hcf($i2,$i1%$i2);
}
else
{
return $i1;
}
}
$hcfofnumber=hcf($num1,$num2);
}
?>
<html>
<head>
<title>Hcf</title>
</head>
<body>
<table>
<form name="frm" method="post" action="">
<tr><td>Number1:</td><td><input type="text" name="number1" /></td></tr>
<tr><td>Number2:</td><td><input type="text" name="number2" /></td></tr>
<tr><td></td><td><input type="submit" name="submit" value="submit" /></td>
<td><center><span>
<?php if(isset($_POST['submit']))
{
echo "HCF is ".$hcfofnumber; }
?>
</span></center></td></tr>
</form>
</table>
</body>
</html>
Program to find whether a year is LEAP year or not
See Answer
<?php
if(isset($_POST['submit']))
{
$year=$_POST['year'];
if($year%4==0)
{
$leap="It is a leap year";
}
else
{
$leap="It is not a leap year";
}
}
?>
<html>
<head>
<title>Leap Year</title>
</head>
<body>
<table>
<form name="frm" method="post" action="">
<tr><td>Enter the year:</td><td><input type="text" name="year" /></td></tr>
<tr><td></td> <td><input type="submit" name="submit" value="submit" /></td>
<td><center><span>
<?php
if(isset($_POST['submit'])){
echo $leap; }
?>
</span></center></td></tr>
</form>
</table>
</body>
</html>
Program to print the below format
* * * * * * * * * * * * * * *
* * * * * * * * * * * * *
* * * * * * * * * * *
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
See Answer
<?php
if(isset($_POST['sub']))
{
$rows=$_POST['row'];
for($i=$rows;$i>=1;--$i)
{
for($space=0;$space<$rows-$i;++$space)
echo " ";
for($j=$i;$j<=2*$i-1;++$j)
echo "* ";
for($j=0;$j<$i-1;++$j)
echo "* ";
echo "<br />";
}
}
?>
<table>
<form method="post" name="frm" action="">
<tr> <td>Enter Number of rows:</td> <td><input type="text" name="row" /></td> </tr>
<tr><td></td> <td><input type="submit" name="sub" /></td> </tr>
</form>
</table>
Program to print below format.
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
See Answer
<?php
if(isset($_POST['sub']))
{
$rows=$_POST['row'];
for($i=$rows;$i>=1;--$i)
{
for($j=1;$j<=$i;++$j)
{
echo $j;
}
echo "<br />";
}
}
?>
<table>
<form method="post" name="frm" action="">
<tr> <td>Enter Number of rows:</td> <td><input type="text" name="row" /></td> </tr>
<tr><td></td> <td><input type="submit" name="sub" /></td> </tr>
</form>
</table>
Program to print below format
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
See Answer
<?php
if(isset($_POST['sub']))
{
$rows=$_POST['row'];
for($i=1;$i<=$rows;$i++)
{
for($j=1;$j<=$i;$j++)
{
echo "*";
}
echo "<br />";
}
}
?>
<table>
<form method="post" name="frm" action="">
<tr> <td>Enter Number of rows:</td> <td><input type="text" name="row" /></td> </tr>
<tr><td></td> <td><input type="submit" name="sub" /></td> </tr>
</form>
</table>
Write a program to print below format
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
See Answer
<?php
if(isset($_POST['sub']))
{
$row=$_POST['row'];
for($i=1;$i<=$row;$i++)
{
for($j=1;$j<=$i;$j++)
{
echo $j;
}
echo "<br />";
}
}
?>
<table>
<form method="post" name="frm" action="">
<tr> <td>Enter Number of rows:</td> <td><input type="text" name="row" /></td> </tr>
<tr><td></td> <td><input type="submit" name="sub" /></td> </tr>
</form>
</table>
Write a program to find factor of any number
See Answer
<?php
if(isset($_POST['sub']))
{ $j=0;
$factor=array();
$num=$_POST['nm1'];
for($i=1;$i<=$num;$i++)
{
if($num%$i==0)
{
$j++;
$factor[$j]=$i;
}
}
}
?>
<table>
<form name="frm" method="post" action="">
<tr> <td>Number:</td> <td><input type="text" name="nm1" /></td> </tr>
<tr><td></td><td><input type="submit" name="sub" /></td>
<td><center><span>
<?php
if(isset($_POST['sub']))
{
echo "Factors are :";for($i=1;$i<=count($factor);$i++)
{ echo $factor[$i].",";
}
}
?>
</span></center></td></tr>
</form>
</table>
Write a program to find table of a number
See Answer
<?php
if(isset($_POST['sub']))
{
$num=$_POST['num'];
echo "<h1><center>Table of " .$num."</center></h1>";
for($i=1;$i<=10;$i++)
{
echo $num*$i;
echo "<br />";
}
}
?>
<table>
<form name="frm" method="post">
<tr><td>Number</td><td><input type="text" name="num"></td></tr>
<tr><td> </td><td><input type="Submit" value="Submit" name="sub"></td></tr>
</form>
</table>
Write a Program for finding the biggest number in an array without using any array functions.
See Answer
<?php
$numbers = array(12,23,45,20,5,6,34,17,9,56,999);
$length = count($numbers);
$max = $numbers[0];
for($i=1;$i<$length;$i++)
{
if($numbers[$i]>$max)
{
$max=$numbers[$i];
}
}
echo "The biggest number is ".$max;
?>
Write a Program to swap two numbers in PHP.
See Answer
<?php
$a=15;
$b=10;
echo "The value of a is ".$a." and b is ".$b;
echo " before swapping.<br />";
$temp=$a;
$a=$b;
$b=$temp;
echo "The value of a is ".$a." and b is ".$b;
echo " After swapping <br />";
?>
Write a Program for Bubble sorting in PHP
See Answer
<?php
$numbers=array(12,23,45,20,5,6,34,17,9,56);
$n=count($numbers);
for ($c = 0 ; $c < ( $n - 1 ); $c++)
{
for ($d = 0 ; $d < ($n - $c - 1); $d++)
{
if ($numbers[$d] > $numbers[$d+1]) /* For decreasing order use < */
{
$swap = $numbers[$d];
$numbers[$d] = $numbers[$d+1];
$numbers[$d+1] = $swap;
}
}
}
echo "Sorted list in ascending order <br />";
for ( $c = 0 ; $c < $n ; $c++ )
echo $numbers[$c]." ";
?>
Write a Program for finding the smallest number in an array
See Answer
<?php
$numbers=array(12,23,45,20,5,6,34,17,9,56);
$length=count($numbers);
$min=$numbers[0];
for($i=1;$i<$length;$i++)
{
if($numbers[$i]<$min)
{
$min=$numbers[$i];
}
}
echo "The smallest number is ".$min;
?>
Write a program to print the below format :
1 5 9
2 6 10
3 7 11
4 8 12
See Answer
<?php
for($i=1;$i<=4;$i++)
{
$i1=$i+4;
$i2=$i+8;
echo $i." ".$i1." ".$i2;
echo "<br />";
}
?>
Write a program for this Pattern:
*****
* *
* *
* *
*****
See Answer
<?php
for($i = 1; $i<=5; $i++){
for($j = 1; $j<=5; $j++){
if($i == 1 || $i == 5){
echo "*";
}
else if($j == 1 || $j == 5){
echo "*";
}
else {
echo " ";
}
}
echo "<br/>";
}
?>
How to print this Pattern:
*0
***00
******000
**********0000
***************00000
See Answer
<?php
$k = 0;
for ($i=1; $i<=5; $i++)
{
$k += $i;
for ($j=1; $j<=$k; $j++)
{
echo "*";
}
for ($z=0; $z<$i; $z++)
{
echo "0";
}
echo "</br>";
}
?>
How to write a Floyd's Triangle?
1
23
456
78910
1112131415
See Answer
<?php
$a = 1;
for($i = 1; $i<=5; $i++)
{
for($j = 1; $j<=$i; $j++)
{
echo $a;
$a++;
}
echo '<br/>';
}
?>
Write a program to make a chess:
See Answer
<table width="270px" cellspacing="0px" cellpadding="0px" border="1px">
<!-- cell 270px wide (8 columns x 60px) -->
<?php
for($row=1;$row<=8;$row++)
{
echo "<tr>";
for($col=1;$col<=8;$col++)
{
$total=$row+$col;
if($total%2==0)
{
echo "<td height=30px width=30px bgcolor=#FFFFFF></td>";
}
else
{
echo "<td height=30px width=30px bgcolor=#000000></td>";
}
}
echo "</tr>";
}
?>
</table>
how to print following table as Output:
See Answer
<table align="left" border="1" cellpadding="3" cellspacing="0">
<?php
for($i=1;$i<=6;$i++)
{
echo "<tr>";
for ($j=1;$j<=5;$j++)
{
echo "<td>$i * $j = ".$i*$j."</td>";
}
echo "</tr>";
}
?>
</table>
How to print following number table:
See Answer
<table width="270px" cellspacing="0px" cellpadding="0px" border="1px">
<!-- cell 270px wide (8 columns x 60px) -->
<?php
//$a = 1;
for($row=1;$row<=10;$row++)
{
echo "<tr>";
for($col=1;$col<=10;$col++)
{
echo "<td>" .($col * $row). "</td>";
}
//$a++;
echo "</tr>";
}
?>
</table>
What would be the output of following:
$a = '1';
echo $b = &$a;
echo $c = "2$b";
See Answer
OUTPUT:
1 // $b value will be 1
21 // $c value will be 21 as 2 is concatenated to the value of $b.
What would be the output of the following?
var_dump(0123 == 123);
var_dump('0123' == 123);
var_dump('0123' === 123);
See Answer
OUTPUT:
bool(false) // As number precede by 0 leads to an octal number.
bool(true) // as 0123 is enclosed in quotes so it would be concerted to it's numeric value which is 123 so it is true.
bool(false) // it's false as o123 is quoted and is string so they are not identical.Their data type is different.
What will be the output of the following:
$x = ture and false;
var_dump($x);
See Answer
OUTPUT:
bool(true) // and operator works as OR because = operator has the precedence over and.
What would be the output of following:
$array = array(
1 => "a",
"1" => "b",
1.5 => "c",
true => "d",
);
print_r($array);
See Answer
OUTPUT:
Array ( [1] => d )
Here all keys will be type casted to number 1. but the value the array will hold will be of the data type whose precedence is higher.precedence hirarchy in increment order is as follows:
String("1") => Number(1) => Float(1.5) => bool(true). so if we omit true element from array then result will be :
Array ( [1] => c )
and so like that.....
Write a program to concatenate two strings character by character.
e.g : JOHN + SMITH = JSOMHINTH
See Answer
<?php
$str= "JOHN";
$str2 = "SMITH";
$a = str_split($str);
$a2 = str_split($str2);
static $j = 0;
for($i = 0; $i<= 9; $i++){
if($i%2 !== 0 && $i >0) {
array_splice($a,$i,0,$a2[$j]);
$j++;
}
}
echo $str_new = implode('',$a);
echo '<br/>';
?>
Program to find the LCM of two numbers.
See Answer
<?php
if(isset($_POST['submit']))
{
$num1=$_POST['number1'];
$num2=$_POST['number2'];
$hcf = gcd($num1, $num2);
$lcm = ($num1*$num2)/$hcf;
}
function gcd($x, $y)
{
if ($x == 0) {
return $y;
}
while ($y != 0) {
if ($x > $y) {
$x = $x - $y;
}
else {
$y = $y - $x;
}
}
return $x;
}
?>
<html>
<head>
<title>LCM</title>
</head>
<body>
<table>
<form name="frm" method="post" action="">
<tr><td>Number1:</td><td><input type="text" name="number1" /></td></tr>
<tr><td>Number2:</td><td><input type="text" name="number2" /></td></tr>
<tr><td></td><td><input type="submit" name="submit" value="submit" /></td>
<td><center><span>
<?php
if(isset($_POST['submit']))
{
echo "LCM is ".$lcm;
}
?>
</span></center></td></tr>
</form>
</table>
</body>
</html>
Write a program to find second highest number in an array.
See Answer
<?php
$array = array('200', '12','69','250','50','500');
$maxnum1 = 0;
$maxnum2 = 0;
for($i=0; $i< count($array); $i++)
{
if($array[$i] > $maxnum1)
{
$maxnum2 = $maxnum1;
$maxnum1 = $array[$i];
}
else if($array[$i] > $maxnum2)
{
$maxnum2 = $array[$i];
}
}
echo "Second Maximum NO is ".$maxnum2;
?>
