如何在 PHP 条件语句中定义 HTML 类

Question

Here I am trying to define HTML classes inside PHP if else statements. For example:

<?php if (condition 1) { ?>
<span class = 'class1'>Line 1</span>

<?php } else if (condition 2) { ?>
<span class = 'class2'>Line 2</span>

<?php } else { ?>
<span class = 'class3'>Line 3</span>

<?php } ?>

Then I can apply custom changes to different classes. Thanks for comments the error is because of syntax errors. However, using this style will not help me hide those warning info before any users' input. For example, if condition 1 is $_POST['name'] == NULL , which meant to remind users to input their names but by default $_POST['name'] is null. This is where I try the second style:

<span class = "<?= condition 1 ? "class 2": "class 1";?>">Some lines</span

but do not know how to add multiple conditions. For example, sometimes users' input is accepted but not in the desired format. Then I need to check if the input exists and whether or not is in the desired format. Hints to either one of my attempts will be helpful.

Answer 1

I dont get it but u mix them as much as u like.

if (condition 1 and condition 2 and !condition 3) {
      //do something
} else if ((condition 1 or condition 2) and !condition 3) {
    if (condition 1) {
        //do something
    }
    if (condition 2) {
        //do something
    }
} else if (condition 3 and !condition 1 and !condition 2) {
    //do something
} else if (condition 3 and condition 1) {
    //do something
} else if (condition 3 and condition 2) {
    //do something
} else {
    //do something
}
     

but u need to be carefull some condition can be true before code gets to them.

Here is a simple edit user checks

$id = $data->user;
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_STRING);
$pass = filter_input(INPUT_POST, 'lozinka', FILTER_SANITIZE_STRING);
$activeStatus = filter_input(INPUT_POST, 'activeStatus', FILTER_SANITIZE_STRING);
$klient_id = filter_input(INPUT_POST, 'klient_id', FILTER_SANITIZE_STRING);


if (empty($username) || empty($email) || empty($klient_id)) {
    echo '<span class="alert alert-danger child">' . lg_fill_all_fields . '</span></div>';
} elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo '<span class="alert alert-danger child">' . lg_invalid_email . '</span></div>';
} elseif (strlen($username) < 5) {
    echo '<span class="alert alert-danger child">' . lg_minimum_5_characters_for_username . '</span></div>';
} elseif (strlen($klient_id) != 5) {
    echo '<span class="alert alert-danger child">' . lg_5_characters_for_client_id . '</span></div>';
} elseif (empty($pass)) {
    $query = 'UPDATE wLogin_users SET klient_id = "' . $klient_id . '", active = "' . $activeStatus . '", username = "' . $username . '", email = "' . $email . '" WHERE id = "' . $id . '"';
    $data->editUser($query);
    echo '<span class="alert alert-success child" id="msg" data-id="99">' . lg_changed_successfully . '</span>';
} elseif (!empty($pass)) {
    if (strlen($pass) < 7) {
        echo '<span class="alert alert-danger child">' . lg_minimum_8_characters_for_password . '</span>';
    } elseif (strlen($pass) > 26) {
        echo '<span class="alert alert-danger child">' . lg_maximum_25_characters_for_password . '</span>';
    } else {
        $password = password_hash($pass, PASSWORD_BCRYPT);
        $query = 'UPDATE wLogin_users SET klient_id = "' . $klient_id . '", active = "' . $activeStatus . '",  username = "' . $username . '", email = "' . $email . '", password = "' . $password . '" WHERE id = "' . $id . '"';
        $data->editUser($query);
        echo '<span class="alert alert-success child" id="msg" data-id="99">' . lg_changed_successfully . '</span>';
    }
}

Answer 2

Your original code block is missing a closing brace

<?php if (condition 1) { ?>
<span class = 'class1'>Line 1</span>

<?php } else if (condition 2) { ?>
<span class = 'class2'>Line 2</span>

<?php } else { ?>
<span class = 'class3'>Line 3</span>

<?php }       // Add this 

See https://3v4l.org/uXv8H