Introduction: In the world of programming, one frequently encounters situations where comparisons and decisions based on conditions are crucial. One such scenario is finding the greatest number among a set of values. In this article, we will explore how to determine the greatest number among three given numbers using PHP. We will take a step-by-step approach, and along the way, we’ll utilize tags and a table to enhance understanding.

Prerequisites: Before we proceed, ensure you have a basic understanding of PHP syntax, variables, and conditional statements.

Step 1: Input the Numbers Let’s start by obtaining input from the user for three numbers. We can utilize PHP’s built-in `readline()` function for this purpose:

``````\$num1 = readline("Enter the first number: ");
\$num2 = readline("Enter the second number: ");
\$num3 = readline("Enter the third number: ");
``````

Step 2: Compare and Find the Greatest With the input obtained, let’s compare the numbers to find the greatest among them. We will use nested if-else statements for comparisons:

``````if (\$num1 >= \$num2 && \$num1 >= \$num3) {
\$greatest = \$num1;
} elseif (\$num2 >= \$num1 && \$num2 >= \$num3) {
\$greatest = \$num2;
} else {
\$greatest = \$num3;
}
``````

Step 3: Display the Result Now that we have identified the greatest number, let’s display the result using PHP’s `echo` statement:

``````echo "Among \$num1, \$num2, and \$num3, the greatest number is: \$greatest";
``````

Step 4: Creating a Visual Reference – The Table To add visual clarity to the comparison, let’s present the numbers and their comparison in a table format. We can use HTML tags along with PHP to create the table:

``````echo "<br><br>";
echo "<table border='1'>";
echo "<tr><th>Number</th><th>Comparison</th></tr>";
echo "<tr><td>\$num1</td><td>" . (\$num1 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "<tr><td>\$num2</td><td>" . (\$num2 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "<tr><td>\$num3</td><td>" . (\$num3 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "</table>";
``````

Complete PHP Code:

``````<?php

\$num1 = readline("Enter the first number: ");
\$num2 = readline("Enter the second number: ");
\$num3 = readline("Enter the third number: ");

if (\$num1 >= \$num2 && \$num1 >= \$num3) {
\$greatest = \$num1;
} elseif (\$num2 >= \$num1 && \$num2 >= \$num3) {
\$greatest = \$num2;
} else {
\$greatest = \$num3;
}

echo "Among \$num1, \$num2, and \$num3, the greatest number is: \$greatest";

echo "<br><br>";
echo "<table border='1'>";
echo "<tr><th>Number</th><th>Comparison</th></tr>";
echo "<tr><td>\$num1</td><td>" . (\$num1 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "<tr><td>\$num2</td><td>" . (\$num2 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "<tr><td>\$num3</td><td>" . (\$num3 == \$greatest ? "Greatest" : "Not the Greatest") . "</td></tr>";
echo "</table>";

?>
``````

## PHP Greatest Number Check

Conclusion: In this comprehensive guide, we learned how to find the greatest number among three given numbers using PHP. Additionally, we created a visual reference by using a table to display the comparison of the numbers. By mastering this fundamental concept, you can make more informed decisions in your programs and build a strong foundation for more complex algorithms. Continue practicing and experimenting with different scenarios to solidify your understanding. Happy coding!

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