The document provides an overview of PHP, a widely used scripting language for web development, highlighting its built-in functions and key features such as server-side scripting, cross-platform compatibility, and database integration. It details the creation and utilization of both pre-existing and custom functions, emphasizing their reusability and the advantages they bring to programming. Additionally, a list of essential built-in functions is included, making this guide a valuable resource for beginners looking to master PHP.

1. Exploring PHP's Built-in Functions
PHP, which stands for Hypertext Preprocessor, is a scripting language widely used in
open-source applications and particularly suitable for web development. It boasts a
plethora of built-in functions that make it easier for developers to accomplish various
tasks. In this guide, delve into some of the fundamental features of PHP and highlight
key built-in functions that beginners should be familiar with. Programming languages
rely on functions, and PHP is no different. You will get into the creation and utilization
of pre-existing and customized PHP functions.
Features of PHP Language
There are some Features of PHP Language which are elaborately explained here for
you as follows.
● Server-Side Scripting: PHP is mainly utilized for server-side scripting, which
implies that the code gets executed on the server before the webpage is
delivered to the user's browser. This allows for dynamic content generation
and interaction with databases, making it essential for creating dynamic
websites and web applications.
● Cross-Platform Compatibility: PHP is a cross-platform language, which means
it can run on various operating systems like Windows, macOS, and Linux
without requiring significant modifications.

2. ● Data Types: PHP is capable of supporting various data types, which include
integers, floats, strings, booleans, arrays, and objects. This versatility enables
developers to manipulate and store data effectively.
● Variables: Variables in PHP are denoted by the dollar sign ($). They allow you
to store and manipulate data throughout your code.
● Conditional Statements: PHP supports familiar conditional statements such as
if, else, if, and else, which enable developers to make decisions and execute
code based on different conditions.
● Loops: Loops like for, while, and for each facilitates repetitive tasks, making it
easier to iterate through arrays or perform actions multiple times.
● Functions: Functions are blocks of reusable code that can be defined and
called upon as needed. PHP provides many built-in functions and the
capability to create custom functions.
● Arrays: PHP's array functions are powerful tools for managing data
collections. They can be indexed, associative, or multidimensional, allowing
developers to store and manipulate data efficiently.
● File Handling: PHP offers functions to read, write, and manipulate files on the
server. This is particularly useful for tasks such as uploading files or reading
data from external sources.
● Database Integration: PHP's database support is extensive, with functions for
connecting to databases, executing queries, and fetching results. The most
commonly used database extension is MySQL.
Key Built-in Functions
● echo(): Used to output text or variables to the screen.

3. ● strlen(): Calculates the length of a string.
● strpos(): Finds the position of the first occurrence of a substring in a string.
● array(): Creates an array.
● count(): Returns the number of elements in an array.
● implode(): Joins array elements into a single string.
● explode(): Splits a string into an array based on a delimiter.
● if(): Checks a condition and executes code if the condition is true.
● foreach(): Iterates through each element in an array.
● include(): Includes and evaluates an external PHP file.
● header(): Sends a raw HTTP header to the browser.
● mysqli_connect(): Establishes a connection to a MySQL database.
● mysqli_query(): Executes a MySQL database query.
● file_get_contents(): Reads a file and returns its contents.
Advantages of PHP Function
● PHP Functions are unique in their reusability. They must only be specified
once and can be called multiple times, setting them apart from other
programming languages.
● Using functions can save much coding, eliminating the need to write the same
logic multiple times. Writing the logic only once can be reused throughout the
code.
● This application's programming logic is easily comprehended because it is
separated into PHP functions. Each logic is divided into functions, which
makes it simpler to understand the flow of the application.
Function Creation and Invocation
For PHP, a function name is any name that concludes with an enclosed pair of
parentheses.
● It is common practice to use the keyword "function" to initiate the name of a
function.
● To execute a function, you only need to type its name, followed by the
parentheses.
● Feature names cannot start with a number. They must begin with a letter or
an underscore.
● The capitalization of a feature name does not matter.
Conclusion
With its abundant built-in functions and flexibility, PHP is a great language for those
new to web development. With features like server-side scripting, conditional
statements, loops, and database integration, PHP empowers developers to create
dynamic and interactive web applications. With the knowledge of essential built-in
functions, beginners can confidently embark on their journey to mastering PHP and

4. creating impactful web experiences. If you have any questions or concerns about PHP
functions, please leave them in the comments section below.
Source: Exploring PHP's Built-in Functions: A Beginner's Guide