I got 'Cannot modify header innformation' error when I add action hook in WordPress

I had a website powered by WordPress. I implement membership register form by using some plugins (contact form 7, Contact Form 7 Multi-Step Forms, and Advanced CF7 DB). I would like to add a...

Get the url to file uploaded by user in contact form 7

I want my users to be able to upload a file in the my contact form and I use contact form 7 like this: [file your-file] Problem is that iam using a 3 party receiver of the mail that can't accept...

Prefill CF7 data from the database using a dynamic field

I am trying to create a method through which I can retrieve the data from the database of contacts saved by contact form 7 and pre-fill the fields after the users have previously selected, from a...

How to update table columns that are stored as rows?

I am first time trying to update plugin data in wordpress database. I am using Advanced CF7 DB plugin for storing contact form 7 data. For updating the column I dont know whether pivot is required...

Build a multidimensional PHP array out of MySQL table data linked by values in one column

I am using a Wordpress plugin (Advanced CF7 DB). It puts the results of the contact form into the MySQL database so it can be displayed on the front end of the website. There are two tables with...