Here is a sample program that will ask the user to give a number and then the program will check and determine if the given number is a positive and negative number. Let us assume zero belongs to a positive number in this example.
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Sample Program Output
Program Listing
index.php
<!DOCTYPE html>
<html lang="en">
<head>
<style>
body {
font-family: arial;
}
</style>
<?php
error_reporting(0);
$display="";
$val_num=$_POST['val_num'];
if(isset($_POST['clear'])){
$val_num="";
$display="";
}
?>
<meta charset="UTF-8">
<title>Positive and Negative Number Checker Using PHP</title>
</head>
<body>
<h2>Positive and Negative Number Using PHP</h2>
<h4>Created By Mr. Jake R. Pomperada</h4>
<form action="" method="post">
<b>Give a Number</b><br/><br>
<input type="text" name="val_num" value="<?php echo $val_num; ?> " required autofocus><br/><br>
<input type="submit" name="submit" value="Submit">
<input type="submit" name="clear" value="Clear">
</form>
<br>
<?php
function phpAlert($msg) {
echo '<script type="text/javascript">alert("' . $msg . '")</script>';
}
if(isset($_POST['submit'])){
$val_num=$_POST['val_num'];
if ( trim($val_num) == '' ) {
phpAlert( "Cannot Be Empty." );
}
if ($val_num >= 0) {
$display=" ";
echo $display;
$display = "The given nunber $val_num is a POSITIVE number.";
echo $display;
}
else {
$display = "The given nunber $val_num is a NEGATIVE number.";
echo $display;
}
}
?>
</body>
</html>
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