In this tutorial, I will show you how to write a program to ask the user to give three numbers, and then the program will determine which of three numbers is the smallest value using PHP programming language.

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Program Listing

<!DOCTYPE html>

<html lang="en">


     <meta charset="UTF-8">

     <meta name="viewport" content="width=device-width, initial-scale=1.0">

     <title>Finding the Smallest Number in PHP</title>


          body {

               background: #f1f1f1;

               font-family: arial;

               size : 16px;


          form {

               background-color: rgba(0, 0, 0, 0.7);

               color: #000;

               padding: 50px;

               position: absolute;

               -webkit-transform: translate(-50%, -50%);

               transform: translate(-50%, -50%);

               left: 50%;

               top: 50%;


          .row {

               display: block;

               font-size: 0;

               margin-bottom: 18px;


          h1,h2 {

               color: #fefefe;

               text-align: center;

               margin: 0 0 40px 0;


          .row label {

               width: 180px;

               color: #fefefe;

               text-transform: uppercase;

               padding-left: 0!important;


          .row input,

          .row textarea {

               background-color: #fefefe;

               width: 280px;

               color: #000000;


          .row textarea {

               resize: none;


          .row label,

          .row input,

          .row textarea {

               vertical-align: top;

               display: inline-block;

               border: 0;

               margin: 0;

               padding: 15px;

               font-size: 15px;


          form button {

               background-color: #16222A;

               width: 250px;

               display: inline-block;

               border: 0;

               padding: 15px;

               color: #fefefe;

               font-size: 15px;

               text-transform: uppercase;

               cursor: pointer;


          form #btnClear {

               background-color: #486980;





          button:focus {

               outline: none;







     $num1 = $_POST['txtFirstNum'];

     $num2 = $_POST['txtSecondNum'];

     $num3 = $_POST['txtThirdNum'];

  function smallest($x, $y, $z) {
    $min = $x;
    if ($x <= $y && $x <= $z)
      {$min = $x;}
    if ($y <= $x && $y <= $z)
      {$min = $y;}
    if ($z <= $x && $z <= $y)
      {$min = $z;}
    $check =  $min;
    return ($check);

    if(isset($_POST['submit'])) {

       $results = smallest($num1,$num2,$num3);             


     if(isset($_POST['clear'])) {

       $num1 = "";
       $num2 = "";
       $num3 = "";
       $result = "";




     <form action="" method="post">


          <div class="row">

               <label for="txtFirstNum">Give First Number</label>

               <input type="text" name="txtFirstNum" 

                value="<?php echo $num1; ?>" autofocus>>


          <div class="row">

               <label for="txtSecondNum">Give Second Number</label>

               <input type="text" name="txtSecondNum"

               value="<?php echo $num2; ?>">>


      <div class="row">

               <label for="txtSecondNum">Give Third Number</label>

               <input type="text" name="txtThirdNum" 

               value="<?php echo $num3; ?>">>


        <div class="row">

              <label for="txtSmallest">The Smallest Number</label>

               <input type="text" name="txtSmallest" 

               value="<?php echo $results; ?>" readonly>


              <div classs="row">

               <button type="submit" name="submit" 


               <button type="submit" name="clear"