Two methods to run PHP script
This article explains different methods to write PHP scripts. Basically PHP is a HTML, without using PHP script in it. A PHP script can be inserted between <?php and ?> tags. General contents can be simply displayed using HTML web page to reduce PHP server script runtime duration.
HTML and PHP
HTML: add.html
<html>
<head>
<title>Addition of Two Numbers</title>
</head>
<body>
<form action="add.php" method="post">
Enter the first number: <input type="text" name="a"><br/>
Enter the second number: <input type="text" name="b"><br/>
<input type="submit" name="submit" value="ADD">
</form>
</body>
</html>
PHP: add.php
<html>
<head>
<title>Addition of Two Numbers</title>
</head>
<body>
<?php
$a = $_POST["a"];
$b = $_POST["b"];
$c = $a + $b;
print "Sum of $a and $b is $c.";
?>
</body>
</html>
Only using PHP
HTML: index.php
<?php
error_reporting (E_ALL ^ E_NOTICE);
$a = $_POST["a"];
$b = $_POST["b"];
if (!isset($_POST["add"])) {
?>
<html>
<head>
<title>Addition of Two Numbers</title>
</head>
<body>
<form method="post" action="<?php echo $PHP_SELF; ?>">
Enter the first number: <input type="text" name="a"></br/>
Enter the second number: <input type="text" name="b"></br/>
<input type="submit" value="ADD" name="add">
</form>
<?php
} else {
$c = $a + $b;
print "Sum of $a and $b is $c.";
}
?>
</body>
</html>
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