Technical Interview Question & Answer

Find two value add value return value are equil?


  
$array = array(2,7,11,15,18); 
for($i=0; $i <count($array);$i++){ 
  for($j= $i+1; $j<count($array);$j++){ 
   $sum = $array[$i] + $array[$j]; 
   if($sum == 9){ 

   echo "Index of $array[$i] 
    $array[$j] is $sum\n"; 

   } 
  } 
} 

// output 2 7

Write program factorial in php?


  
 function factorial($n){

if($n<=1){
 return 1;
}
return $n * factorial ($n-1);
 }
 echo factorial(5);

Find Odd and Even without loop?


  
 "First Program"; 
 $a[0] = "Even";
 $a[1] = "Odd";
 echo $a[5%2]; // Output Odd


 "Second Program"; 
 $array  = array('Even','Odd');
 $number = 5;
 echo $array[$number%2];


"Third Program"; 
 $n = 6;
 if($n&1){
echo "Odd";
 }else{
 echo "Even"; // Output Even

 }

Second Max value in array?


  
 function findSecondMax($arr) {
    $max = 0;
    $secondMax = 0;

    foreach ($arr as $num) {
        if ($num > $max) {
            $secondMax = $max;
            $max = $num;
        } elseif ($num < $max && $num > $secondMax) {
            $secondMax = $num;
        }
    }

    return $secondMax ?$secondMax: "No second maximum exists";
}

// Example usage:
echo findSecondMax([5, 3, 8, 1, 9, 2]); // Output: 8
echo findSecondMax([1, 1, 1]); // Output: No second maximum exists
echo findSecondMax([7, 7, 7]); // Output: No second maximum exists
echo findSecondMax([10, 5, 8, 12, 3]); // Output: 10

Write a program sort array in php?


  
  $arr = [64, 34, 25, 12, 22, 11, 90];
 $n = count($arr);
    
    // Outer loop for passes
    for ($i = 0; $i < $n - 1; $i++) {
        // Inner loop for comparisons
        for ($j = 0; $j < $n - $i - 1; $j++) {
            // Compare adjacent elements
            if ($arr[$j] > $arr[$j + 1]) {
                // Swap if they are in wrong order
                $temp = $arr[$j];
                $arr[$j] = $arr[$j + 1];
                $arr[$j + 1] = $temp;
            }
        }
    }
    
    echo "<pre>";print_r($arr);
//Output
[0] => 11
[1] => 12
[2] => 22
[3] => 25
[4] => 34
[5] => 64
[6] => 90

Write a program prime number in php?


  
  function isPrime($num) {
    if ($num <= 1) {
        return false;
    }
    for ($i = 2; $i < $num; $i++) {
        if ($num % $i == 0) {
            return false; 
        }
    }

    return true; 
}
$number = 7;
if (isPrime($number)) {
    echo "$number is a prime number.";
} else {
    echo "$number is not a prime number.";
}

Write a program palindrome number in php?


  
  Step First string

  function Palindrome($string){  
    if (strrev($string) == $string){  
        return 1;  
    }
    else{
        return 0;
    }
}  

// Driver Code
$original = "DADDAD"; 
if(Palindrome($original)){  
    echo "Palindrome";  
} 
else {  
echo "Not a Palindrome";  
}

//Second Program  string without pre-difine function

 //without pre-define function
function isPalindrome($str) {    
    $i = 0;
    $j = strlen($str) - 1;  
    while ($i < $j) {        
        if ($str[$i] !== $str[$j]) {
            return false;  
        }
        $i++;   
        $j--;  
	}    
    return true;  
}
$string = "aabbaa";
if (isPalindrome($string)) {
    echo "$string is a palindrome!";
} else {
    echo "$string is not a palindrome!";
}

//Third program

$number = 12121;
$temp = $number;
$reverse = 0;

// Reverse the number
while ($temp > 0) {
    $digit = $temp % 10;
    $reverse = ($reverse * 10) + $digit;
    $temp = (int)($temp / 10);
}

// Check if original and reversed are the same
if ($number == $reverse) {
    echo "$number is a palindrome number.";
} else {
    echo "$number is not a palindrome number.";
}

write a program array duplicate count number in php?


  
 $arr = array(1, 2, 3, 2, 4, 1, 5, 3);  
$length = 0;
$counts = [];
$duplicateCount = 0;
while (isset($arr[$length])) {
    $length++;
}

// Count occurrences of each element
for ($i = 0; $i < $length; $i++) {
    $count = 1;  
    for ($j = $i + 1; $j < $length; $j++) {
        if ($arr[$i] == $arr[$j]) {
            $count++;
        }
    }
    
    $isProcessed = false;
    for ($k = 0; $k < $i; $k++) {
        if ($arr[$k] == $arr[$i]) {
            $isProcessed = true;
            break;
        }
    }
    if (!$isProcessed) {
        $counts[$arr[$i]] = $count;
        if ($count > 1) {
            $duplicateCount++;
        }
    }
}


echo "Duplicate count: $duplicateCount\n";
echo "Element counts:\n";
foreach ($counts as $element => $count) {
    echo "$element appears $count time(s)\n";
}

// Output results

 Array: [1, 2, 3, 2, 4, 1, 5, 3]
Duplicate count: 3
Element counts:
1 appears 2 time(s)
2 appears 2 time(s)
3 appears 2 time(s)
4 appears 1 time(s)
5 appears 1 time(s)

write a program array duplicate count string in php?


  
    $arr = "abdbabdbaab"; // Example array
$length = 0;
$counts = [];
$duplicateCount = 0;

// Calculate array length manually
while (isset($arr[$length])) {
    $length++;
}

// Count occurrences of each string
for ($i = 0; $i < $length; $i++) {
    $count = 1; // Count current string itself
    for ($j = $i + 1; $j < $length; $j++) {
        if ($arr[$i] === $arr[$j]) {
            $count++;
        }
    }
    // Store count only if not already processed
    $isProcessed = false;
    for ($k = 0; $k < $i; $k++) {
        if ($arr[$k] === $arr[$i]) {
            $isProcessed = true;
            break;
        }
    }
    if (!$isProcessed) {
        $counts[$arr[$i]] = $count;
        if ($count > 1) {
            $duplicateCount++;
        }
    }
}

// Output results
 
 
echo "String counts:\n";
foreach ($counts as $string => $count) {
    echo "$string appears $count time(s)\n";
}

What is the output of the following code?


  
    $array = array(1 => "a", "1" => "b", 1.5 => "c", true => "d");

echo $array[1];


output d

What does the following PHP code output, and why?


  
 
$number = 3;
echo $number;
echo $number++ + $number++;
echo $number;
echo $number-- - $number--;
echo $number;
 

Output
3
7
5
1
3

What does the following PHP code output, and why?


  
 
$array = ['a' => 'apple', 'b' => 'banana', 'c' => 'cherry'];
unset($array['b']);
$result = array_keys($array);

echo implode(", ", $result);
 

Output
a
c

What will be the output of the code below and why?


  
  $x = 5;
echo $x;
echo "<br />";
echo $x+++$x++;
echo "<br />";
echo $x;
echo "<br />";
echo $x---$x--;
echo "<br />";
echo $x;

Output
5
11
7
1
5

What will be the values of $a and $b after the code below is executed?


  
$a = '1';
$b = &$a;
$b = "2$b";

Output
21

After the code below is executed, what will be the value of $text and what will strlen($text) return?


  
$text = 'John ';
$text[10] = 'Doe';

Output
“John      D”

PHP_INT_MAX is a PHP?


  
var_dump(PHP_INT_MAX)

Output
 int(9223372036854775807)

What does the follow code echo?


  
$a = "PHP";
$a = $a + 1;
echo $a;

Output
Fatal error: Uncaught TypeError string

HTML Boilerplate Shortcut (Emmet)?


  
Type: !

Then Press: Tab


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
</body>
</html>

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Technical Interview Question & Answer

Find two value add value return value are equil?

Write program factorial in php?

Find Odd and Even without loop?

Second Max value in array?

Write a program sort array in php?

Write a program prime number in php?

Write a program palindrome number in php?

write a program array duplicate count number in php?

write a program array duplicate count string in php?

What is the output of the following code?

What does the following PHP code output, and why?

What does the following PHP code output, and why?

What will be the output of the code below and why?

What will be the values of $a and $b after the code below is executed?

After the code below is executed, what will be the value of $text and what will strlen($text) return?

PHP_INT_MAX is a PHP?

What does the follow code echo?

HTML Boilerplate Shortcut (Emmet)?

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