Outputting the Value of a Variable
To build a dynamic and interactive PHP program, it is useful to output variables and their values. The PHP language allows for multiple methods of value output. This topic covers the standard methods of printing a value in PHP and where these methods can be used.
An operator is something that takes one or more values (or expressions, in programming jargon) and yields another value (so that the construction itself becomes an expression).
Operators can be grouped according to the number of values they take.
The PDO (PHP Data Objects) extension allows developers to connect to numerous different types of databases and execute queries against them in a uniform, object oriented manner.
As the majority of websites run off PHP, application security is an important topic for PHP developers to protect their website, data, and clients. This topic covers best security practices in PHP as well as common vulnerabilities and weaknesses with example fixes in PHP.
Classes and Objects
Classes and Objects are used to to make your code more efficient and less repetitive by grouping similar tasks.
A class is used to define the actions and data structure used to build objects. The objects are then built using this predefined structure.
An array is a data structure that stores an arbitrary number of values in a single value. An array in PHP is actually an ordered map, where map is a type that associates values to keys.