Calculate BMI(Body Mass Index) using PHP program

The Body Mass Index (BMI) is a quick way to assess your body size simply with your weight and height, regardless of your gender. Quickly calculate your BMI and find out which category you fall into.The Body Mass Index (BMI) is the only index validated by the World Health Organization to assess an individual’s build and therefore health risks. The BMI makes it possible to determine whether one is the situation of thinness, overweight or obesity for example.PHP Code: How to Calculate BMI(Body Mass Index) Using PHP With HTML Form


<?php

if($_POST!=null)
{
    $h=empty($_POST["height"]) ? 0 : $_POST["height"];
    $w=empty($_POST["weight"]) ? 0 : $_POST["weight"];
    $index =0;
    if($h !=0 && $w !=0)
        $index = round($w/($h*$h)* 703,2);

    $bmi="";
    $bmiStyle="alert alert-primary";
    if ($index < 18.5) {
        $bmi="underweight - BMI : " . $index;
        $bmiStyle="alert alert-secondary";
    } else if ($index < 25) {
        $bmi="normal - BMI : ". $index;
        $bmiStyle="alert alert-success";
    } else if ($index < 30) {
        $bmi="overweight - BMI : " . $index;  
        $bmiStyle="alert alert-warning";
    } else {
        $bmi="obese - BMI : " .$index;  
        $bmiStyle="alert alert-danger";
    }
}

?>
<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title> CODE4EXAMPLE </title>
    <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet">
</head>

	<body>
        <div class="container">
            <h1>PHP BODY MASS INDEX (BMI)</h1>
            <form method="post">
                <div class="form-group">
                  <label for="height">Please Enter your Height in Inches :</label>
                  <input type="text" class="form-control" name="height" placeholder="69">
                </div>
                <div class="form-group">
                  <label for="weight">Please Enter your weight in Pounds :</label>
                  <input type="text" class="form-control"  name="weight" placeholder="150">
                </div>
                <div class="form-group">
                  <button type="submit" class="btn btn-success">Calculate</button>
                </div>
              </form>
              <div class="<?=$bmiStyle?>" role="alert" id="bmi">
                <?php 
                echo $bmi;
                ?>
            </div>
          </div>  
    
   
</body>
</html>

<?php

if($_POST!=null)

{

$h=empty($_POST["height"]) ? 0 : $_POST["height"];

$w=empty($_POST["weight"]) ? 0 : $_POST["weight"];

$index =0;

if($h !=0 && $w !=0)

$index = round($w/($h*$h)* 703,2);

$bmi="";

$bmiStyle="alert alert-primary";

if ($index < 18.5) {

$bmi="underweight - BMI : " . $index;

$bmiStyle="alert alert-secondary";

} else if ($index < 25) {

$bmi="normal - BMI : ". $index;

$bmiStyle="alert alert-success";

} else if ($index < 30) {

$bmi="overweight - BMI : " . $index;

$bmiStyle="alert alert-warning";

} else {

$bmi="obese - BMI : " .$index;

$bmiStyle="alert alert-danger";

}

<!DOCTYPE html>

<head>

<title> CODE4EXAMPLE </title>

</head>

<body>

<h1>PHP BODY MASS INDEX (BMI)</h1>

<label for="height">Please Enter your Height in Inches :</label>

</div>

<label for="weight">Please Enter your weight in Pounds :</label>

</div>

<button type="submit" class="btn btn-success">Calculate</button>

</div>

</form>

<div class="<?=$bmiStyle?>" role="alert" id="bmi">

<?php

echo $bmi;

</div>

</body>

</html>

Output:

How to Calculate BMI(Body Mass Index) Using PHP With HTML Form

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