A simple program that I wrote that will ask the user to give a number and then the program will generate an inverted triangle using the symbol of asterisk in php programming language.
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Program Listing
index.php
<?php
$res = "";
if (isset($_POST["txtNum"])) {
$num = $_POST["txtNum"];
while ($num >= 0) {
$num--;
for ($i = 0; $i<=$num; $i++) {
$res .= '*';
}
$res .= "<br>";
}
$res = "<p>".$res."</p>";
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>The Asterisk Problem</title>
<style>
form {
width: 250px;
margin: 200px auto 0;
}
fieldset {
padding: 20px 25px 20px 20px;
}
input {
width: 100%;
}
</style>
</head>
<body>
<form action="" method="post">
<fieldset>
<legend>The Asterisk Problem</legend>
<label for="fname">Enter a number:</label>
<input type="number" id="txtNum" name="txtNum"><br><br>
<button type="submit">Submit</button>
</fieldset>
<?php echo $res; ?>
</form>
</body>
</html>
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