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>
- Results this form:

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute indicates that an input field must be filled out before submitting?
required="required" autofocus="autofocus" placeholder="text"
<input type="text" name="name1" required="required" />
Which CSS method increases or decreases the size of the HTML element (including its content)?
translate() scale() skew()
#some_id:hover {
  transform: scale(2, 1.5);
  -ms-transform: scale(2, 1.5);    /* IE 9 */
  -moz-transform: scale(2, 1.5);   /* Firefox */
}
Click on the Date object method that returns the day of the month.
setDate() getMonth() getDate()
var rightnow = new Date();
var day = rightnow.getDate();
alert(day);
Which function is used to upload a file on server?
is_file() move_uploaded_file() fopen()
if(move_uploaded_file($_FILES["field_name"]["tmp_name"], "dir/file_name")) {
  echo "The file succesfully uploaded";
}
Simple arithmetic calculator in PHP

Last accessed pages

  1. Node.js Move and Copy file (5418)
  2. Wake Up! (3403)
  3. Ajax-PHP Chat Script (37775)
  4. PHP-MySQL Scripts (3924)
  5. Create simple Website with PHP (20532)

Popular pages this month

  1. Insert, Select and Update NULL value in MySQL (415)
  2. Read Excel file data in PHP - PhpExcelReader (331)
  3. PhpSpreadsheet - Read, Write Excel and LibreOffice Calc files (257)
  4. PHP getElementById and getElementsByTagName (208)
  5. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (199)