The code from this page shows how to make a
simple arithmetic calculator in PHP with the basic operators (addition, subtraction, multiplication, division), using a html form and a simple php script.
- Click on the code to select it.
<?php
$res =''; //store the outputed value (added in html)
//if required form data submitted
if(isset($_POST['nr1']) && isset($_POST['nr2']) && isset($_POST['opr'])){
//get form data
$nr1 = floatval($_POST['nr1']);
$nr2 = floatval($_POST['nr2']);
$opr = trim(strip_tags($_POST['opr']));
//calculate according to $opr
if($opr =='+') $res = $nr1 + $nr2;
else if($opr =='-') $res = $nr1 - $nr2;
else if($opr =='*') $res = $nr1 * $nr2;
else if($opr =='/') $res = $nr1 / $nr2;
$res = $nr1 .' '. $opr .' '. $nr2 .' = '. number_format($res, 2);
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Arithmetic calculator</title>
</head>
<body>
<?php echo $res; ?>
<form action="" method="post">
<input type ="number" name="nr1" id="nr1" step="any" value="0">
<select name="opr" id="opr">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type ="number" name="nr2" id="nr2" step="any" value=""><br>
<input type ="submit" value="Calculate">
</form>
</body>
</html>
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Daily Test with Code Example
HTML
CSS
JavaScript
PHP-MySQL
Which tag is used to add definition lists into a <dl> element?
<dt> <dd> <li><dl>
<dt>HTML</dt>
<dd> - Hyper Text Markup Language</dd>
<dd> - Language for web pages</dd>
</dl>
Which CSS property can hide an element on page, letting an empty space in its place?
display position visibility#id {
visibility: hidden;
}Click on the event which is triggered when the mouse clicks on an object.
onclick onmouseover onfocus document.getElementById("id").onclick = function(){
alert("http://CoursesWeb.net/");
}Indicate the PHP variable that contains the contents of both $_GET, $_POST, and $_COOKIE arrays.
$_SESSION $_GET $_REQUESTif(isset($_REQUEST["id"])) {
echo $_REQUEST["id"];
}