how can I create special views search
You can create an exposed view filter using 'global: combine fields filter', and select all the fields where you want to search the 'hello' (or wathever word you want) word. As long as you don't specify a content type, you will get all the elements that contain one of those fields with the written word.
To add the fields to the combine filter you need to have them on the fields you are showing in the view, but you can hide them if you want.
edit: this is a solution in D7 and but I think D8 may provide a very similar system.
How to create a special autoincrement field?
I have a "Property" content type created for a real estate web site. The Property content type has a taxonomy field called "Type" where type can be House, Office, Apartment and so on... I want to create a "code" field that has to be something like "H-1" where H is for Home and 1 must be an incremental number, so houses will have each a different co...
How can I convert special characters to normal characters in an URL query string?
? and = will be used as parts in my url. In generating the url, I use <?php echo l('node/'. $someID .'/delete?destination=chapter/'. $anotherID);?>. When I check on Firebug, the href attribute of the link is not the usual url, instead of having ?, it is being replaced with %3F and = is being replaced with %3D. How do I fix this?