The function wp_ob_end_flush_all() in WordPress

WordPress is one of the most popular content management systems, offering incredible capabilities for developers. One of the interesting functions in WordPress is the function wp_ob_end_flush_all(). This function is primarily used for output buffering and can help ensure that the generated content is displayed correctly and without errors to the user.

By using wp_ob_end_flush_all(), you can conclude all active buffers and send their outputs to the browser. This function is particularly useful in situations where there are multiple buffers, as it provides better control over the output content. For instance, if you want to ensure that no unexpected buffer disrupts page display, you can utilize this function.

In fact, this function is part of the internal functions of WordPress that is designed to optimize loading speed of designed pages. When multiple buffers are in use, it may happen that some information is not displayed correctly or is missing content. For this reason, such a function is essential for developers.

Now let’s take a look at how to use wp_ob_end_flush_all(). If you are developing a plugin or a theme and want to make sure that all buffered content is displayed correctly, you can use this function at the termination point of the output buffering code. Additionally, you can observe a simple example of this function:

function my_custom_function() {
    \/\/ Start output buffering
    ob_start();
    echo "Hello World!";
    
    \/\/ End all active buffers and send output to browser
    wp_ob_end_flush_all();
}

add_action('wp_footer', 'my_custom_function');

In this code, we start output buffering using ob_start(). Afterward, the content "Hello World!" is generated and stored in the buffer. Ultimately, by calling wp_ob_end_flush_all(), all buffered content is sent to the browser.

Code Explanations