Tutorials for PHP Function with Parameters or Arguments

What is Function with Parameters or Arguments?

The information or variables included within the function’s parentheses are referred to as parameters. These are used to keep track of values that can be used during runtime. The comma(,) operator allows the user to input as many arguments as he wants. These options are used to accept inputs during runtime. When transferring numbers, such as during a function call, arguments are used. A parameter is a container for parameters that are given to a function. A value supplied to a function is referred to as an argument. In layman’s terms, both parameter and statement have the same meaning. It’s crucial to keep in mind that each parameter must be accompanied with an argument.

PHP functions,Parameters and arguments

Syntex:-

function function_name($first_parameter, $second_parameter) {
    executable code;
}

Example:-

Setting Default Values for Function parameter:-

In PHP, we may define default arguments for function parameters. If no argument is supplied for a parameter with a default value, PHP will call the function with the parameter’s default specified value.

The default value for the parameter $num in the previous example is 12; if no value is supplied for this parameter in a function call, the default value is used. It’s also required because the option $str has no default value.

Functions with return values:-

Functions can also return values to the portion of the program where they were called. The value is returned to the program section from where it was named using the return keyword. It is possible to return any type of value, including arrays and objects. The return statement also marks the conclusion of the function, stops it from running, and returns the value.

Parameter passing to Functions:-

In PHP, there are two ways to pass an argument to a function.

Pass by Value:– Moving by value changes the value of an argument within a function, while the original value outside the function stays unaffected. This means that a statement that is a duplicate of the original value is transmitted.

Pass by Reference:– As statements are passed via proxy, the original value is transmitted. As a result, the starting value has changed. Using the ampersand symbol in pass by reference, we just transmit the value’s address, where it is kept (&).

Example:-

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Tutorials for PHP Functions

What is Functions?

Complete Guide and Tutorials for PHP Functions with example -  DevOpsSchool.com

A function is a segment of code in a program that is written to do a certain task. We should compare functions to workers in a real-world workplace to have a better grasp of how they work. Assume the management delegated the duty of determining the annual budget to one of his employees. So, what will be the outcome of this procedure? The employee would ask his supervisor for data, perform estimations, calculate the budget, and report the results to his superior. Functions work in a similar fashion. They accept data as an argument, process it using a set of statements or operations, and then return the output.

How many Types of Functions in PHP?

Complete Guide and Tutorials for PHP Functions with example -  DevOpsSchool.com

There are Two Types of Functions :-

User Defined Functions:-These capabilities are used by developers and programmers when they need to execute their own logic. This functions are specified with the keyword function, and when a function call is made, a sequence of statements will be written within the function to execute it. Simply type functionname() in the address bar, and the function will be run.

Built-in functions:- These routines offer us with already-built-in library functionality. The PHP installation kit includes several capabilities, making the language more efficient and helpful. To use the function’s attributes, all we have to do is call it when we want the desired outcome. PHP makes use of date, numeric, string, and other built-in functions.

  • String Functions: These PHP features include built-in support for working with strings. Some of the string methods in PHP include strpos(), strncmp(), strrev(), and strlen() ,
  • Date Function: The format is a human-readable UNIX date and time format, and these functions are PHP standard components.
  • Numeric Functions: These functions have their own preset logic for numeric operations that PHP provides. As a result, it will either return a Boolean or a numeric value. Among them are is number(), number format(), round(), and other numeric procedures.

Why we should Use Functions in PHP?

Reusability:- This programming language has a feature that reduces the amount of lines of code that must be written many times. This would save time and effort for the developer or coder. We can put a piece of code in a feature and call it whenever and wherever it’s needed if it has to be used in many locations. This may be done by calling the functions from other programmes or from inside the same package.

Easier Error Detection:- Because the code is written as functions rather than single blocks, any problems may be immediately and readily recognized and rectified.

Easily Maintained:- Because functions are used throughout the program, we may quickly modify any function or line of code in the function, and the change will be reflected. As a result, it is simple to maintain everywhere.

How to create functions in PHP?

Complete Guide and Tutorials for PHP Functions with example -  DevOpsSchool.com

A function is to find a collection of statements in a programmer repeatedly. When a function in a program is invoked, it is simply implemented. There are a few things to keep in mind while creating a user-identified feature.

  • Any word ending in an opened and closed parenthesis is a feature.
  • The function keyword is commonly used to start a name of the function.
  • Type your name followed by a parenthesis to launch a command.
  • The initial letter in a function word cannot be a number. It might start with a letter or an emphasis.
  • The name of a feature is important.

Example:-

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Define “Here Document” in PHP

Here Document-

PHP here document is another way of displaying text. A here document is just some text inserted directly in a PHP page.

Syntax-

echo <<< Token

Where Token is word that begins and ends the here document.

Ex-

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Difference Between echo and print in PHP

Echo

This statement is used to output the data to the screen or printing text on
screen.

Ex: –

echo with HTML
echo with Variables

print

This is very similar to echo statement a way of displaying text.

Ex-

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Tutorials for PHP Data type

What is Data Types?

Their sizes, as well as the names of the variables, might change. In most programming languages (such as C++ and Java), you may use a number of data types for variables. However, because PHP does not specify type explicitly, the variable type must be determined by the form or type of data to which it is applied.

What are the Data Types used in PHP?

PHP Data Types - Tutorial And Example

There are many data types for various purposes, such as null, binary, integer, float, text, object, property, and an array. We employ eight different types of data in PHP to create our variables. Below is a brief explanation of the various categories.

Basic of PHP

Integers − There are whole numbers, including 4195, without a decimal point.

Doubles − Floating points are numbers such as 3.14159 or 49.1

Booleans − Have either true or false only two possible values.

NULL − It has only one value: NULL, is a special kind.

Strings − There are character strings, such as ‘PHP supports string operations.’

Arrays − Collections of other values are called and indexed.

Objects − There are instances of programming classes that can package other class-specific values and functions.

Resources − Special variables provide access to external PHP tools (such as database connections).

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Tutorials for PHP Variables

What is Variable?

In any programming language, a variable is a computer memory name that represents knowledge. One of the numerous computer program components is the variables. For declare a variable in php, the $ sign with its signature, like $myVariable, can be used.

How to declare PHP variable?

  • All variables in PHP start with a $(doller) sign followed by the name of the variable.
  • A valid Variable name starts with a letter (A-Z, a-z) or underscore(_), followed by any number of letters, numbers, or underscores.
  • If a variable name is more than one word, it can be separated with underscore(for example $employee_code instead of $employeecode).
  • ‘$’ is a special variable that can not be assigned.

What are the Types of Variable?

Local Variables:- A local variable is one that only exists inside a certain scope. They only exist in the function in which they were created. They’re frequently referred to as automatic variables since they’re produced automatically when the function starts running and disappear immediately when it’s completed. The term auto can be used to create these variables explicitly, but it isn’t required because auto is the default.

Global Variables:- A global variable is one that is defined outside of all functions and is accessible to all of them. These variables are unaffected by scopes and are always accessible, implying that a global variable persists until the program is terminated. It’s possible to make a global variable in one file and use it in another. The variable must be defined in both files to do this, but the term extern must come before the “second” declaration.

Static Variables:- A global or local variable can be a static variable. Both are generated by using the term static before the variable definition. A local static variable is one that can keep its value from one function call to the next and will persist until the program is finished. When creating a local static variable, it should be given an initial value. If it isn’t, the value will be set to 0 by default. A global static variable may only be accessed within the file in which it was created. File scope is a term used to describe a variable’s scope.

Variable Initialization?

PHP can store all type of data in variables. Before using a variable in PHP, assign a value to it so PHP will create that variable and store data in it. That means we have to assign data to a variable before attempting to read a variable’s value.

Example:-

$roll = 256;
$price = 25.50;
$name = “Geeky Shows”;
Note - If a variable is created without a value, it is automatically assigned a value of NULL.
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Basic Structure of PHP

Basic Structure of PHP

The server executes the PHP script, which will send the HTML output to the browser. Normally HTML and PHP tags can be present. A popular open source general programming language, PHP or Hypertext Preprocessor may be built into an HTML. The .php extension is used to store PHP files. In PHP tags, PHP scripts and standard HTML may be written in any page.

For beginners or pros alike, PHP is a pleasant language to use. We start working with PHP in this PHP Tutorial Series on the first floor. Even more experienced developers who need refreshment are very great to start from the start. Frequently you will realize that sophisticated difficulties are often a fairly fundamental mistake. That’s what makes the fundamentals so vital. They are the foundation for building on your whole understanding of programming. So let’s start getting our hands dirty with PHP today we look at what PHP is, and the history of this some times contentious language.

Examples:-

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How PHP works?

How PHP works?

Chapter 1 : Introduction to PHP

The PHP programmer communicates with the website server, which transmits web pages to the rest of the globe. You are instructing the web server in the URL to send an HTML file if you input a URL in your web browser’s address bar. The requested file is sent by the web server. Your browser reads the HTML file and displays the site. You also request a file from the web server when you press a source on a webpage. In addition, when you click a web page button that submits a form, a file is processed by the web server. The method is precisely the same when PHP is mounted. You are submitting a file and, because of PHP, the web server that runs PHP answers with HTML. Through these steps you can stand:-

Step-1:- Client send a page request to the web server.

Step 2 – Web server forwards that request to the PHP interpreter.

Step 3 – Now PHP interpreter will take the Date from Database and response it back to the Web server.

Step 4 – At last Web server response to the client who has asked for the page request.

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What is PHP?

What is PHP?

What is PHP? - Quora

PHP is an open source programming and server scripting language that is especially well suited for creating static or dynamic web pages, as well as Web applications, and may be included in HTML codes. It’s used to develop full e-commerce websites, as well as handle complicated content, databases, and session logging. Although PHP is now commonly known as a hypertext preprocessor, it was originally known as Personal Home Page. It was created in 1994 by Rasmus Lerdorf, a programmer. PHP is a reasonably straightforward language to learn, but you must first have a solid understanding of HTML. PHP works with a variety of databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server, and may communicate with other services using LDAP, POP3, HTTP, IMAP, and COM protocols. PHP runs on a variety of operating systems, including Windows, Linux, Unix, and Mac OS X, among others.

What are the features of PHP?

Why do we need PHP? - Quora

The beauty of PHP is that it is extremely simple for a beginner to learn while still providing a variety of advanced capabilities for a seasoned developer. Don’t be scared off by PHP’s extensive list of capabilities. In a few of hours, you should be able to start developing simple programmes.

  • On a computer, PHP performs system activities like as creating, opening, reading, writing, and closing files.
  • PHP can handle formats, which means it can get data from databases, save it to a file, email it to the user, and return it to them.
  • You can edit, delete, and add entries to your database using PHP.
  • PHP’s main focus on Server-side scripting. If you want to practice as an independent at home, that’s the way forward.
  • Command line scripting is suitable for scripts in scheduling tasks. For simple text editing, it is also handy.
  • PHP helps us communication on all servers, such as MySQL, back-end/database.
  • To get the current date you will use PHP and then build a monthly calendar.
  • The HTML code generation in web browsers is often used by PHP.
  • PHP may be used to rotate the banner advertising on your website.
  • You may use PHP to limit the access of a user to one web page.
  • You may create a login page with PHP for your user.
  • Set up a database with a web browser.

Why we use PHP Language?

Why should we learn php programming language | PHP Zone

You’ve heard of several other programming languages, and perhaps are interested about why we select PHP as our web programming poison. PHP is well documented online and has a robust function structure. The language is therefore reasonably easy to learn and has a big online community. There are a host of PHP techniques and difficulties forums and manuals, so you should find no help if you want them. Here’s a fundamental point.

  • It works on several systems, such as Windows, Linux and Unix.
  • It works for several databases such as MySQL, PostgreSQL and Oracle.
  • PHP is a free open source programming language for anybody.
  • The learning curve is relatively quick in contrast to other languages like as JSP, ASP, and others.
  • The language can be easily collected and used on the server side. It works nicely.
  • This is perfect for creating the web since it can be included into the HTML code directly.
  • It is commonly used in combination with Apache on many operating systems (the application server). It is also Microsoft IIS compatible on Windows.
  • PHP may also be used for the production of interactive websites.
  • PHP also has the benefit of a server-side scripting language, which means that you just have to install it on your server. Client computers requiring server services are unnecessary for PHP. It is sufficient to use a web browser.
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Advance PHP

What was easy in any language was made core and what became difficult was made an advance. What happens in Core is of basic level and what happens in Advance is of upper-level.

Object Oriented Progrmming

Object-Oriented Programming is a Technic that solves the problem. In this, the code breaks the object. And you see your problem on the side of the object. In which you find your problem similar to the real-world problem and it is easy to maintain, and it has to be solved.

Class

The PHP class has a group of values. To manipulate whatever value you write inside the class, you also write operations in it. The class gives you this facility, that if the user does not need to know the information. So you can also hide the information. To use the application, you can keep it hidden for security purposes. Or if it will be accessed from the outside users or from an outside viewer then your application may be damaged. That’s why you can keep your application hidden, it gives class facility. You can define type using class.

Rule

  • The class name can be any valid label.
  • It can’t be PHP reserved world.
  • The class name must start with a letter or an underscore. Following by any number of letters, numbers, or underscore all this will work. Lwkin should not start with number.
class Classname
{
	var $variable_name;  (It is also called Data Member/Properties or Attribute.)
	var $variable_name;
	
	function Method_name()
	{
		Body of method;
	}
	function Method_name(parameter_list)     (And these methods are called methods or member functions.)
	{
		Body of Method;
	}

}

See your problem in the real world.

class Mobile
{
	public $model;
	function show Model (Sumber)
	{
		$this->model = $number;
		echo "Model Number: $this->model";
	}
	
}

Object

The object is a variable of class data type. Whenever you create an object, for that object, whatever is proper inside the class, a copy of it is prepared and it is prepared for that object. If there are 2 objects then 2 copies of that variable or that property will be created and one copy for the first object and a second copy for the second object. Whatever object you make, its copy will be ready and one copy will be distributed. But this is not the case with the member function. The member function is the same, all the objects share with it.

The new Operator is used to create an object.

Syntax:

class Mobile
{
	public $model;
	function show Model (Sumber)
	{
		$this->model = $number;
		echo "Model Number: $this->model";
	}
	
}
$samsung = new Mobile;
$samsung->showModel('A5');

$lg = new Mobile;
$lg->showModel('M30');

You will not need to write the class, again and again, you just have to create an object of it. And call this method with the help of that object. It will show its own model number.

Important thing

A class is of no importance unless it has an object.

Accessing class member using object

How would you make accessing a member of a class into a user object?

-> This operator is used to access the member of the class.

object_name->variable_name;
$samsung->model;

access to method
Object_name->method_name();
$samsung->showModel();

in parameter
Object_name->method_name(parameter_list)
$samsung->showModel(‘A8’);

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