How to Change Image Src to Data Src for Lazy Load using the Image_send_to_editor Filter in WordPress

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Are you looking to improve the loading speed of your WordPress site by implementing lazy loading for images? Lazy loading is a technique that delays the loading of images until they are needed, which helps to reduce the initial page load time. In this article, we will explore how to use the ‘image_send_to_editor’ filter to change the image source attribute (‘src’) to a ‘data-src’ attribute, enabling you to easily incorporate lazy loading into your WordPress site. Let’s dive in and optimize your image loading experience!

					function wpturbo_change_image_src_to_data_src($html, $id, $caption, $title, $align, $url, $size, $alt) {
    $new_html = str_replace('src=', 'data-src=', $html);
    return $new_html;
add_filter('image_send_to_editor', 'wpturbo_change_image_src_to_data_src', 10, 8);

The code snippet provided allows you to change the source attribute (src) of an image tag in WordPress to a data-src attribute instead. This is useful when you want to implement lazy loading on your images, which helps improve page load times by loading the images only when they are actually visible to the user.

Let’s break down the code and understand how it works.

The first part of the code defines a new function called wpturbo_change_image_src_to_data_src(). This function takes several parameters – $html, $id, $caption, $title, $align, $url, $size, and $alt. These parameters represent the various attributes and information associated with the image being processed.

Inside the function, we use the str_replace() function to replace all occurrences of src= with data-src= in the $html string. The $html variable contains the entire HTML markup for the image tag that is being sent to the editor.

$new_html = str_replace('src=', 'data-src=', $html);

The str_replace() function takes three arguments – the string to search for (src=), the replacement string (data-src=), and the input string ($html). It replaces all occurrences of the search string with the replacement string and stores the modified string in the $new_html variable.

Finally, the modified HTML markup is returned using the return statement.

return $new_html;

To apply this functionality, we need to hook our custom function into the image_send_to_editor filter. This filter is fired before an image is sent to the editor, allowing us to modify the image tag before it is inserted into the content.

The add_filter() function is used to add our custom function as a filter to the image_send_to_editor hook. The first argument of add_filter() specifies the hook to which we are adding the filter, and the second argument is the name of our custom function.

add_filter('image_send_to_editor', 'wpturbo_change_image_src_to_data_src', 10, 8);

In this case, the filter is applied to the image_send_to_editor hook, and the wpturbo_change_image_src_to_data_src function is called whenever the hook is triggered. The 10 and 8 parameters indicate the priority and number of arguments the function accepts, respectively.

By adding this code to your WordPress theme or plugin, you can easily modify the source attribute of image tags to use the data-src attribute instead. This allows you to implement lazy loading on your website and enhance the user experience by reducing page load times.

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