There is no page output after the sub-function is called.

I wrote a function A and called function B to output a piece of html. But I found that as long as the B function is called, this html will not be output on the page.
If you copy this html directly into function A and block the call of function B, the html will be output.
What exactly went wrong?

A function code:

<code>public static function cartbinet_display_setting_html_page() {
    echo '<div class="wrap">';
    
    /*display xml data*/
    //$xmlfile = plugins_url( 'cartbinet-server/data/cartbinets.xml' );
    //$xml = simplexml_load_file($xmlfile);
    //var_dump($xmlfile);
    //var_dump($xml);
    //cartbinet_display_xml_data($xml);
    
    /*display setting content*/
    cartbinet_display_setting_page();
<?php        
    echo '</div>';
} 
</code>

The

B function is:

<code>public static function cartbinet_display_setting_page( ) {
    ?>
        <h2>Set Copyright</h2>   
        <form method="post" action="options.php">  
            <?php /* 下面这行代码用来保存表单中内容到数据库 */ ?>  
            <?php wp_nonce_field('update-options'); ?>  

            <p>  
                <textarea  
                    name="display_copyright_text" 
                    id="display_copyright_text" 
                    cols="40" 
                    rows="6"><?php echo get_option('display_copyright_text'); ?></textarea>  
            </p>  

            <p>  
                <input type="hidden" name="action" value="update" />  
                <input type="hidden" name="page_options" value="display_copyright_text" />  

                <input type="submit" value="Save" class="button-primary" />  
            </p>
        </form>  
    <?php  
    } </code>

Reply content:

I wrote a function A and called function B to output a piece of html. But I found that as long as the B function is called, this html will not be output on the page.
If you copy this html directly into function A and block the call of function B, the html will be output.
What exactly went wrong?

A function code:

<code>public static function cartbinet_display_setting_html_page() {
    echo '<div class="wrap">';
    
    /*display xml data*/
    //$xmlfile = plugins_url( 'cartbinet-server/data/cartbinets.xml' );
    //$xml = simplexml_load_file($xmlfile);
    //var_dump($xmlfile);
    //var_dump($xml);
    //cartbinet_display_xml_data($xml);
    
    /*display setting content*/
    cartbinet_display_setting_page();
<?php        
    echo '</div>';
} 
</code>

The

B function is:

<code>public static function cartbinet_display_setting_page( ) {
    ?>
        <h2>Set Copyright</h2>   
        <form method="post" action="options.php">  
            <?php /* 下面这行代码用来保存表单中内容到数据库 */ ?>  
            <?php wp_nonce_field('update-options'); ?>  

            <p>  
                <textarea  
                    name="display_copyright_text" 
                    id="display_copyright_text" 
                    cols="40" 
                    rows="6"><?php echo get_option('display_copyright_text'); ?></textarea>  
            </p>  

            <p>  
                <input type="hidden" name="action" value="update" />  
                <input type="hidden" name="page_options" value="display_copyright_text" />  

                <input type="submit" value="Save" class="button-primary" />  
            </p>
        </form>  
    <?php  
    } </code>

Would you get an error if you write like this? I’ll give it a try first...

Okay! There’s really no error!

<code><?php 

class Tpl {
  static function show() {
      echo "?:";
  ?>
    why?
  <?php 
  
  }
}

Tpl::show();</code>

The method you have here should be slef::method,$this->method $obj->method, right?

Your B function has neither return nor echo