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How to print Fibonacci series in PHP?
What is Fibonacci series?
A series of numbers in which each number is the sum of the two preceding numbers. The simplest is the series 0,1, 1, 2, 3, 5, 8, & so on. Here, 0+1 = 1 1+1=2 3+2=5 ….
Logic:
- First initial the 1st and 2nd number as 0 and 1.
- Print 1st and 2nd number.
- From next number, start loop(for loop using here). So 3rd number will be the sum of the previous two numbers.
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| <?php | |
| // Program to find n numbers of Fibonacci series | |
| extract($_REQUEST); | |
| if (isset($submit)) { | |
| $firstNumber = 0; | |
| $secondNumber = 1; | |
| $nextNumber ; | |
| echo "<h3>Fibonacci series for first $number numbers: </h3>"; | |
| echo "</br>"; | |
| for ($i=0; $i < $number; $i++) { | |
| if ($i<=1) { | |
| $nextNumber=$i; | |
| }else{ | |
| $nextNumber =$firstNumber+$secondNumber; | |
| $firstNumber=$secondNumber; | |
| $secondNumber=$nextNumber; | |
| } | |
| echo "<h2> $nextNumber   </h2>" ; | |
| } | |
| } | |
| ?> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Fibonacci Series</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=Comfortaa:wght@300;400&display=swap" rel="stylesheet"> | |
| <style> | |
| body{ | |
| background-color:lightblue; | |
| font-family: 'Comfortaa', cursive; | |
| } | |
| input[type=text]{ | |
| width: 100%; | |
| padding: 12px; | |
| border: 1px solid #ccc; | |
| border-radius: 4px; | |
| box-sizing: border-box; | |
| resize: vertical; | |
| } | |
| h3{ | |
| text-align: center; | |
| } | |
| h2{ | |
| display: inline; | |
| margin-left: 200px; | |
| } | |
| label{ | |
| padding: 12px 12px 12px 0; | |
| display: inline-block; | |
| } | |
| input[type=submit]{ | |
| background-color: #4caf50; | |
| color: white; | |
| padding: 12px 20px; | |
| border: none; | |
| border-radius: 4px; | |
| cursor: pointer; | |
| float: right; | |
| } | |
| .container{ | |
| width: 40%; | |
| margin: 0 auto; | |
| border-radius: 5px; | |
| background-color: #CED8DD; | |
| padding: 20px; | |
| } | |
| .col-25{ | |
| float: left; | |
| width: 25%; | |
| margin-top: 6px; | |
| } | |
| .col-75{ | |
| float: left; | |
| width: 75%; | |
| margin-top: 6px; | |
| } | |
| .row:after{ | |
| content: " "; | |
| display: table; | |
| clear: both; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <section> | |
| <div class="container"> | |
| <form action="fib.php" method="POST"> | |
| <div class="row"> | |
| <label>Please enter Number here</label> | |
| </div> | |
| <div class="row"> | |
| <div class="col-75"> | |
| <input type="text" name="number" placeholder="Please enter number here" | |
| id="number" autocomplete="off"> | |
| </div> | |
| <div class="col-25"> | |
| <input type="submit" name="submit" value="Submit"> | |
| </div> | |
| </div> | |
| </form> | |
| </div> | |
| </section> | |
| </body> | |
| </html> |
by 
Output: 0 1 1 2 3
PHP Fundamental Tutorials with Basic Demo by Chentan in 2020 – Part-1
PHP Fundamental Tutorials with Basic Demo by Chentan in 2020 – Part-2
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