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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
<!DOCTYPE html>
<html>
<body>
<form method="post">
输入数字：<input type="text" name="num" required>
<input type="submit" value="判断">
</form>
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$num = $_POST["num"];
if (!is_numeric($num)) {
echo "错误：请输入有效数字！";
} else {
$integer = (int)$num;
echo $integer % 2 == 0
? "$integer 是偶数"
: "$integer 是奇数";
}
}
?>
</body>
</html>