To check if a number is positive or negative in PHP using an HTML form, you can create a simple web page that takes input from the user through a form and then processes that input in PHP. Here’s an example of how you can do this:
- Create an HTML form (
index.html):-
1234567891011121314<!DOCTYPE html><html><head><title>Positive/Negative Number Checker</title></head><body><h1>Positive/Negative Number Checker</h1><form method="post" action="check_number.php"><label for="number">Enter a number: </label><input type="number" name="number" id="number" required><button type="submit">Check</button></form></body></html>
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- Create a PHP script (
check_number.php) to process the form input and check if the number is positive or negative:-
12345678910111213141516171819202122232425262728293031<?phpif ($_SERVER["REQUEST_METHOD"] === "POST") {// Get the user input from the form$number = $_POST["number"];// Check if the number is positive, negative, or zeroif ($number > 0) {$result = "The number $number is positive.";} elseif ($number < 0) {$result = "The number $number is negative.";} else {$result = "The number $number is zero.";}}?><!DOCTYPE html><html><head><title>Positive/Negative Number Checker</title></head><body><h1>Result</h1><?php if (isset($result)) : ?><p><?php echo $result; ?></p><?php else : ?><p>No input received.</p><?php endif; ?><a href="index.html">Go back</a></body></html>
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Here’s how this works:
- The
index.htmlfile contains a form with an input field where the user can enter a number. When the user submits the form, it sends the input to thecheck_number.phpscript for processing. - In
check_number.php, we check if the request method isPOST, which indicates that the form has been submitted. We retrieve the user input using$_POST["number"]. - We then use PHP to check if the number is positive, negative, or zero, and store the result in the
$resultvariable. - Finally, we display the result on the web page along with a link to go back to the input form.
To use this code, save the HTML code in an index.html file and the PHP code in a check_number.php file in the same directory. Open the index.html file in your web browser, enter a number in the form, and click “Check” to see the result.
