How to set and get cookies using Java Script and PHP. Set lifetime and delete cookies.
How to put the AND, OR, NEGATIVE icon correctly for logical operators. Ternary operator If. Comparison operators for programming languages Java Script and PHP.
What to do when the table in the database is large? How to optimize the storage of information on different tables? How to automatically create new tables in php. And how to combine several tables of the same type, identical in structure, with the same columns into one temporary, virtual table in the PHP programming language.