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How to print the number in reverse order in PHP?
In this program, you’ll learn to reverse a number using a while loop.
Logic:
- First of all, the remainder of $num divided by 10 is stored in the variable $rem. Now, $rem contains the last digit of $num, i.e. 3.
- $rem is then added to the variable $rev after multiplying it by 10.
- Multiplication by 10 adds a new place in the $rev contains. $rev contain like this 0 * 10 + 3 = 3.
- $num is then divided by 10 so that now it only contains first two digits: 12.
- After second iteration, $rem equals 2, $rev equals 3 * 10 + 2 = 32 and $num = 1.
- After third iteration, $rem equals 2, $rev equals 32 * 10 + 1 = 321 and $num = 0.
- Now, $num will be existed outside the while loop and $rev contains 321.
Now , look at this coding
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| <?php | |
| $message = ''; | |
| if (isset($_POST['num'])) { | |
| if (!empty($_POST['num'])) { | |
| $num = $_POST['num']; | |
| $rev=0; | |
| $temp =$num; // number is stored for temporary in temp variable | |
| while ($temp>1) { | |
| $rem = $temp%10; | |
| $rev =($rev * 10) + $rem; | |
| $temp =($temp / 10); | |
| } | |
| //echo "<h3> Reverse number of $num is: $rev </h3>"; | |
| $message = "Reverse number of $num is: $rev"; | |
| }else{ | |
| echo "<h4>No number has been ebtered</h4>"; | |
| } | |
| } | |
| ?> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Reverse program</title> | |
| <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> | |
| <link rel ="stylesheet" type="text/css" href="css/bootstrap.min.css"> | |
| <link href="https://fonts.googleapis.com/css2?family=Balsamiq+Sans&display=swap" rel="stylesheet"> | |
| <style> | |
| body{ | |
| font-size: 25px; | |
| font-family: 'Balsamiq Sans', cursive; | |
| background-color: #46C7C7; | |
| } | |
| .container{ | |
| width: 50%; | |
| margin: 0 auto; | |
| border-radius: 5px; | |
| background-color: #f2f2f2; | |
| padding: 20px; | |
| } | |
| input[type=text], textarea{ | |
| width: 150%; | |
| padding: 10px; | |
| border: 1px solid #ccc; | |
| border-radius: 4px; | |
| box-sizing: border-box; | |
| resize: vertical; | |
| color: #2B3856; | |
| } | |
| input[type=submit]{ | |
| color: white; | |
| padding: 15px 20px; | |
| border: none; | |
| border-radius: 5px; | |
| cursor: pointer; | |
| float: right; | |
| } | |
| label{ | |
| color: #2B547E; | |
| } | |
| .col-6{ | |
| float: left; | |
| width: 25%; | |
| margin-top: 6px; | |
| align: right; | |
| } | |
| .row:after{ | |
| content: " "; | |
| display: table; | |
| clear: both; | |
| } | |
| h2,h3,h4{ | |
| text-align: center; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <?php | |
| if (!empty($message)) { | |
| ?> | |
| <div class="row"> | |
| <h3> <?php echo $message; ?></h3> | |
| </div> | |
| <?php | |
| } ?> | |
| <form action="reverse.php" method="POST"> | |
| <div> | |
| <label>Enter the number :</label> | |
| </div> | |
| <div class="row"> | |
| <div class="col-6"> | |
| <textarea name="num" rows="5" cols="40"></textarea> | |
| </div> | |
| <div class="col-6"> | |
| <input type="submit" class="btn btn-primary btn-lg" name="submit" value="Submit"> | |
| </div> | |
| </div> | |
| </form> | |
| </div> | |
| </body> | |
| </html> |
by Input : 12345
Thanks
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