php验证表单元素是否为空的实例代码：

HTML代码：

PHP代码：

$errors=0;

$nickname=$_POST['nickname'];

$firstname=$_POST['firstname'];

$lastname=$_POST['lastname'];

$email=$_POST['email'];

if (!trim($nickname)) {

echo "
Nickname is required.";

$errors++;

}

if (!trim($firstname)) {

echo "
First name is required.";

$errors++;

}

if (!trim($lastname)) {

echo "
Last name is required.";

$errors++;

}

if (!trim($email)) {

echo "
Primary email address is required.";

$errors++;

}

if ($errors > 0)

echo "


Please use your browser's back button " .

"to return to the form,and correct error(s)";

?>

（编辑：安卓应用网）

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