PHP program to Convert Fahrenheit to Celsius

This script is basically apt for School / College students or Newbies who are willing to do the same kind of script which they learned from C programming.

All of us know Basic C program learners should be gone through this kind of programs pretty well, Such as Convert Fahrenheit to Celsius, Addition, Multiplication, etc.,

So, This tutorial is about to teach you a similar kind of Program “Convert Fahrenheit to Celsius” in PHP.

The formula is pretty simple:

<?php

$celsius = ($fahrenheit - 32)*5/9;

?>

<?php

$celsius = ($fahrenheit - 32)*5/9;

This is not a Console program, PHP is a web programming language. So, to get the input, you should always use HTML Web Form.

Let’s see the entire script. Well, read the comments to understand what is happening:

Code Snippet (with comments):

 <?php

 //get the value from the form after hit the enter button
 if($_POST){
    //method="post" so we have to use $_POST
    //get the value from input field
    $fahrenheit = $_POST['fahrenheit'];
    //fahrenheit to celsius formula
    $celsius = ($fahrenheit - 32)*5/9;
 }
 ?>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Convert Fahrenheit to Celsius in PHP</title>
    </head>
    <body>
        <form action="" method="post">
        Fahrenheit: <input type="text" name="fahrenheit" /><br />
        <?php 
        //show the celsius after hit the enter button and the calculation
        if(isset($celsius)){
            echo "Celsius = ".$celsius;
        }
        ?>
       </form>
    </body>
</html>

<?php

//get the value from the form after hit the enter button

if($_POST){

//method="post" so we have to use $_POST

//get the value from input field

$fahrenheit = $_POST['fahrenheit'];

//fahrenheit to celsius formula

$celsius = ($fahrenheit - 32)*5/9;

}

<!DOCTYPE html>

<html>

<head>

<title>Convert Fahrenheit to Celsius in PHP</title>

</head>

<body>

Fahrenheit: <input type="text" name="fahrenheit" /><br />

<?php

//show the celsius after hit the enter button and the calculation

if(isset($celsius)){

echo "Celsius = ".$celsius;

}

</form>

</body>

</html>

Code Snippet (without comments):

 <?php
 if($_POST){
    $fahrenheit = $_POST['fahrenheit'];
    $celsius = ($fahrenheit - 32)*5/9;
 }
 ?>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Convert Fahrenheit to Celsius in PHP</title>
    </head>
    <body>
        <form action="" method="post">
        Fahrenheit: <input type="text" name="fahrenheit" /><br />
        <?php 
        if(isset($celsius)){
            echo "Celsius = ".$celsius;
        }
        ?>
       </form
    </body>
</html>

<?php

if($_POST){

$fahrenheit = $_POST['fahrenheit'];

$celsius = ($fahrenheit - 32)*5/9;

}

<!DOCTYPE html>

<html>

<head>

<title>Convert Fahrenheit to Celsius in PHP</title>

</head>

<body>

Fahrenheit: <input type="text" name="fahrenheit" /><br />

<?php

if(isset($celsius)){

echo "Celsius = ".$celsius;

}

</form

</body>

</html>

I have given “with Comments” and “without Comments”, you can take any one of the above code and paste it in your favorite editor then run the script. Enjoy the Day!

PHP program to Convert Fahrenheit to Celsius

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