检查是否设置了单选按钮

Question

在PHP中，我想检查单选按钮是否被选中；我用 isset 这样做，但有些东西不起作用。

html:

 <form action="test.php" method="post" name="form_contribute" id="form_contribute">
            <fieldset>
                <legend>Required information</legend> 
                <p>Type of publication</p>
                <div id="radio_buttons">
                    <label for="p_book">Book</label>
                    <input type="radio" name="p_radio" id="p_book" value="p_book">

                    <label for="p_article">Article</label>
                    <input type="radio" name="p_radio" id="p_article" value="p_article">

                    <label for="journal">Journal</label>
                    <input type="radio" name="p_radio" id="p_journal" value="p_journal">


                </div>

                <div id="contribute">

                    Title <input type="text" name="quote_title" id="quote_title">
                    Author(s)* <input type="text" name="author" id="author">
                    Title <input type="text" name="title" id="title">
                    ISBN <input type="text" name="isbn" id="isbn">
                    Publisher <input type="text" name="publisher" id="publisher">
                    Source <input type="text" name="source" id="source">
                    Addendum <textarea id="addendum"></textarea>
                    <div id="instructions">
                        <ul>
                            <li>Add only published non-fiction works; </li>
                            <li>Fill in all the required fields (designated by an asterix at the end);</li>
                            <li>Write the ISBN without space or special characters; if no ISBN, use identifier code as replacement;</li>
                            <li>Title should be written in English; exceptions are made for works unpublished in English;</li>
                            <li>Publisher should be the publisher of where your source derives from, not the original publisher of the work;</li>
                            <li>Source is to be used for verification; add chapter, section, page;</li>
                            <li>Use addendum to add other relevant info (e.g. if you've translated the material yourself; if the author is anonymous;) </li>
                        </ul>
                    </div> <!-- end #instructions -->
                </div>

            </fieldset>
            <div class="big_button">
                <input type="submit" name="edify_button" id="edify_button" value="Edify">
            </div>
        </form>

在php中：

error_reporting(E_ALL); ini_set('display_errors', 'On');

    if (isset($_POST['edify_button']) && isset($_POST['p_radio'])) {

        $radio_values = $_POST['p_radio'];
        if ($radio_values) {
            echo 'checked';
        }else  {
            echo 'unchecked';
    }
}

我也试过 !empty($_POST['my_radio']。我没有收到任何错误，只是一个空白页。在 if 语句中，在另一个测试中，我添加了 if $radio_values == null，然后添加了一些内容，但这也无济于事。 php 中是否有我不知道的 checked 值？

Answer 1

if (isset($_POST['my_button']) && isset($_POST['my_radio'])) {

        $radio_values = $_POST['my_radio'];
        if ($radio_values) {
            echo 'not null';
        }else {
            echo 'null';
    }}

如果没有选择单选按钮，您会得到空白页，因为您正在一起验证 isset($_POST['my_button']) && isset($_POST['my_radio'])，而 isset($_POST['my_radio'] 只有在选中任何单选按钮时才会 return 为真。

Answer 2

使用双层嵌套的方法，例如：

<?php

error_reporting(E_ALL);
ini_set('display_errors', 'On');

if (isset($_POST['edify_button'])){

    if(isset($_POST['p_radio'])) {

        $radio_values = $_POST['p_radio'];
            echo 'checked';
        }else  {
            echo 'unchecked';
    }
}

?>

它会让你的问题消失，然后工作 ;-)

检查是否设置了单选按钮

Check if radio buttons are set

php

radio-button