PHP TRAINING
- 1. The abbreviation PHP initially stood for Personal Homepage. But now it is a recursive acronym for Hypertext Preprocessor. (It's recursive in the sense that the first word itself is an abbreviation, so the full meaning doesn't follow the abbreviation.) The first version of PHP was launched 26 years ago. Now it's on version 8, released in November 2020, but version 7 remains the most widely used. PHP runs on the Zend engine, which is the most popular implementation. There are some other implementations as well, like parrot, HPVM (Hip Hop Virtual Machine), and Hip Hop, created by Facebook. PHP is mostly used for making web servers. It runs on the browser and is also capable of running in the command line. So, if you don't feel like showing your code output in the browser, you can show it in the i
- 3. PHP String A string is a sequence of characters, like "Hello world!". A string can be any text inside quotes. You can use single or double quotes: PHP Integer An integer data type is a non-decimal number between - 2,147,483,648 and 2,147,483,647. Rules for integers: An integer must have at least one digit An integer must not have a decimal point An integer can be either positive or negative Integers can be specified in: decimal (base 10), hexadecimal (base 16), octal (base 8), or binary (base 2) notation
- 4. PHP Float A float (floating point number) is a number with a decimal point or a number in exponential form. PHP Boolean A Boolean represents two possible states: TRUE or FALSE. $x = true; $y = false; Booleans are often used in conditional testing. You will learn more about conditional testing in a later chapter of this tutorial.
- 5. PHP Array An array stores multiple values in one single variable. PHP Object Classes and objects are the two main aspects of object-oriented programming. A class is a template for objects, and an object is an instance of a class. When the individual objects are created, they inherit all the properties and behaviors from the class, but each object will have different values for the properties. Let's assume we have a class named Car. A Car can have properties like model, color, etc. We can define variables like $model, $color, and so on, to hold the values of these properties. When the individual objects (Volvo, BMW, Toyota, etc.) are created, they inherit all the properties and behaviors from the class, but each object will have different values for the properties. If you create a __construct() function, PHP will automatically call this function when you create an object from a class.
- 6. PHP NULL Value Null is a special data type which can have only one value: NULL. A variable of data type NULL is a variable that has no value assigned to it. Tip: If a variable is created without a value, it is automatically assigned a value of NULL. PHP Resource The special resource type is not an actual data type. It is the storing of a reference to functions and resources external to PHP. A common example of using the resource data type is a database call.
- 8. PHP language : The name PHP stands for Hypertext Preprocessor and denotes a server-side scripting language, which suggests that applications are written thereon run on web servers and don’t depend upon the online browser. Syntax of PHP language is analogous to C language. It is created by Rasmus Lerdorf and appeared in 1995. PHP is being widely utilized in developing web applications and became one of the main languages for developers to make new applications. Leading social networking sites like Facebook and reputed organizations like Harvard University are both using PHP which makes PHP popular and increases its credibility.
- 9. PHP is getting used widely in developing web- based and other applications across all domains. Few technologies whose development is supported by PHP are listed below : Content Management System. Web-based applications and development of sites. E-commerce websites and applications. Data Analytics and Representation. Processing of Images. Graphical interface design-based applications. Developing the features of Flash.
- 10. Advantages of PHP : The most important advantage of PHP is that it’s open-source and free from cost. It can be downloaded anywhere and is readily available to use for events or web applications. It is platform-independent. PHP-based applications can run on any OS like UNIX, Linux, Windows, etc. Applications can easily be loaded which are based on PHP and connected to the database. It’s mainly used due to its faster rate of loading over slow internet speed than other programming language. It has less learning curve because it is simple and straightforward to use. Someone familiar with C programming can easily work on PHP. It is more stable for a few years with the assistance of providing continuous support to various versions. It helps in reusing an equivalent code and not got have to write lengthy code and sophisticated structure for events of web applications. It helps in managing code easily.
- 11. Disadvantages of PHP : It is not that secure due to its open-source, because the ASCII text file is often easily available. It is not suitable for giant content-based web applications. It has a weak type, which can cause incorrect data and knowledge to users. PHP frameworks got to learn to use PHP built-in functionalities to avoid writing additional code. Using more features of PHP framework and tools cause poor performance of online applications. PHP doesn’t allow change or modification in the core behavior of online applications. The PHP frameworks aren’t equivalent in behavior so does their performance and features.
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