How can I debug my PHP code, and what is the essence

Question

For PHP

Answer 1

Just go step by step and check each and every exception or error and solve one by one.

Answer 2

If you are using Visual Studio it will help a little by telling you at which line you forgot something, but If your code doesn't have any errors then you will have to check the algorithms and do like what 🅰🅹 - Pʀᴏᴅᴜᴄᴛ Mᴀɴᴀɢᴇʀ said