PHP Exercises: Check the largest number among three given integers

Last update on May 28 2025 09:29:38 (UTC/GMT +8 hours)

18. Largest of Three Integers

Write a PHP program to check the largest number among three given integers.

Sample Solution:

PHP Code :

<?php
// Define a function that takes three parameters and returns the maximum value among them
function test($x, $y, $z) 
{
  // Find the maximum value using the max function, first comparing $x and $y, and then comparing the result with $z
  $max = max($x, max($y, $z));
  return $max;
}

// Test the function with different sets of values
echo test(1, 2, 3)."\n";
echo test(1, 3, 2)."\n";
echo test(1, 1, 1)."\n";
echo test(1, 2, 2)."\n";
?>

Explanation:

• Function Definition:
• The test function takes three parameters: $x, $y, and $z.
• Finding the Maximum Value:
• It calculates the maximum value among the three parameters by using the max function.
• First, it finds the maximum between $y and $z using max($y, $z).
• Then, it compares the result with $x to get the overall maximum value, storing it in $max.
• Return Statement:
• The function returns the value of $max.
• Function Calls and Output:
• First Call: test(1, 2, 3) returns 3 as the highest value.
• Second Call: test(1, 3, 2) returns 3 as the highest value.
• Third Call: test(1, 1, 1) returns 1 since all values are equal.
• Fourth Call: test(1, 2, 2) returns 2 as the highest value.

Output:

3
3
1
2

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP script to compare three integers and return the largest value using nested ternary operators.
• Write a PHP function to determine the maximum among three numbers without using built-in max() function.
• Write a PHP program to compare three user inputs and output the greatest integer with error checking.
• Write a PHP script to apply an iterative method to find the maximum value from three given numbers.

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