PHP函数回显包含文件

Question

I'm currently developing a wordpress plugin. I created a shortcode which displays the content of another html/php file this looks like this:

function df_display_form()
{
    // Fetching some data with $wpdb

    // Display the data
    include_once plugin_dir_path(__FILE__) . 'markup/show-dynamic-form.php';
}

My problem is that the shortcode will be showed at the top of the page. So I googled this issus and found a solution . As it is writte there the problem is that return should be used instead of echo .

So my question is how can I return the renderd content from the included file? (not echo).

Answer 1

Try using an output buffer. https://www.php.net/manual/en/function.ob-get-clean.php

function df_display_form()
{
    ob_start(); 
    // Fetching some data with $wpdb

    // Display the data
    include_once plugin_dir_path(__FILE__) . 'markup/show-dynamic-form.php';
    $out = ob_get_clean();
    return $out;
}

Answer 2

You have to use php fuction to display the form using shortcode.

I think you have currently this type of code in show-dynamic-form.php file.

<?php

// Some codes

?>

<form>

Form elements

</form>

It will just echo your code to the top of your post or page. Correct way is:

<?php

    // Some codes

    $variable = '<form>';
    $variable .= 'form elements';
    $variable .= '</form>';

    return $variable;

?>

Try to use this way in your dynamic-form.php file and it should work.