Finding a filter in 3rd party plugin

  • I have been Googling this for about half an hour and feel like I must be making this harder than it needs to be.

    I have a theme that comes with a plugin that creates a slideshow. The problem is the theme/plugin doesn’t use a custom image size that is specific to the slideshow. You have to size the image before you upload it. I don’t want to ask my client to do that. I want them to upload the image and have WP create the appropriate site. So, I added a custom image size but it doesn’t appear anywhere as an option to assign it to the slideshow. I know the custom images are being created because I can see them in the uploads folder.

    I am intentionally not naming the theme or plugin because this is a general question.

    How do I find out if there is a filter applied to the images that are used in the plugin?

    All I want to do is set the image to use my custom image size. Doesn’t seem like it would be that hard if I knew what filter to use. I found a plugin called Simply Show Hooks which shows all the hooks and filters used on a page but it’s a huge list and I can’t if one is used for the slider.

    If there is a tutorial on how to find filters or something like that I’ll take it. But, all the tutorials on using filters just pull one from the WP Codex, which has documentation.

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  • Moderator Steven Stern (sterndata)

    (@sterndata)

    Volunteer Forum Moderator

    1) grep the plugin files looking for “do_action” and “apply_filters”

    2) see if your plugin is listed here: https://hookr.io/

    Thread Starter swani

    (@swani)

    Hey Steve,

    Thank you for for the reply. I searched the plugin files for “apply filters” and didn’t get anything that looked right. So, applying the same principle, I searched again for the class name on the div that contains the image and found the file that creates the slides. Here’s the problem, there is no filter there. So, I started looking into how I modify the plugin. I’m going to add this for anyone reading this in the future: There is no equivalent to the child theme idea for plugins.

    So, I have been reading up on “forking” a plugin. This sounds a little intense for my skill level. I’m going to start by contacting the plugin author and ask if they would be willing/able to add some filters. I’ll post back if I press on with the forking option.

    Graham

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