PHP Articles - Page 68 of 90

We will face two cases while calling the parent constructor method in child class.Case1We can't run directly the parent class constructor in child class if the child class defines a constructor. In order to run a parent constructor, a call to parent::__construct() within the child constructor is required.Example Live DemoOutput: I am in Tutorials Point I am not in Tutorials PointExplanationIn the above example, we have used parent::__construct() to call the parent class constructor.Case2If the child does not define a constructor then it may be inherited from the parent class just like a normal class method(if it was not declared as ... Read More

In PHP, we utilize session_start() an inbuilt function to start the session .But the problem we face in a PHP script is if we execute it more than once it throws an error. So here we will learn how to check the session started or not without calling session_start() function twice.There are two ways to follow to resolve this problem.For below PHP 5.4.0 version.ExampleExplanationIf the session not started this code above will always start the session in the PHP script.In the second method, we can utilize the function session_status(), which returns the status of the present session. This function can ... Read More

In this article, we will learn about pass by value and pass by reference in PHP. Now, let’s understand these two concepts in detail.In PHP generally, we followed to pass the arguments to the function with passed by value approach. We are following this practice because if the value of the argument within the function is changed, it does not get changed outside of the function.In some cases we may need to modify function arguments, So to allow a function to modify its arguments, they must be passed by reference.Let's begin with passed by reference. As it is already mentioned we ... Read More

In this article, we learn the best way to create getter and setter strategies in PHP. Getter and setter strategies are utilized when we need to restrict the direct access to the variables by end-users. Getters and setters are methods used to define or retrieve the values of variables, normally private ones.Just as the name suggests, a getter method is a technique that gets or recovers the value of an object. Also, a setter method is a technique that sets the value of an object.ExampleLet's understand the use of getter and setter methods through an example.Output:PHP Error Cannot access private ... Read More

To begin with, Polymorphism is gotten from the Greek words Poly (which means many) and morphism (which meaning forms).Polymorphism portrays an example in object-oriented programming where methods in various classes that do similar things should have a similar name. Polymorphism is essentially an OOP pattern that enables numerous classes with different functionalities to execute or share a commonInterface. The usefulness of polymorphism is code written in different classes doesn't have any effect which class it belongs because they are used in the same way. In order to ensure that the classes do implement the polymorphism guideline, we can pick between ... Read More

To display two decimals, use number_format(). Let us first write the PHP code for the same. We have first declared two variables are initialized −$number1=10.3423; $number2=10;Now, display the two decimals using the number_format() function −$result1=number_format ($number1, 2); $result2=number_format ($number2, 2);ExampleFollowing is the example −OutputFollowing is the snapshot of PHP code −10.34 10.00

Method Overloading is a concept of Object Oriented Programming which helps in building the composite application in an easy way. Function overloading or method overloading is a feature that permits making creating several methods with a similar name that works differently from one another in the type of the input parameters it accepts as arguments.The above concept is fine for other programming languages and it is called static polymorphic i.e method overloading.ExampleLet's understand through an example.Output:ErrorExplanation:This will generate an error since php will say you have declared this method twice.But Other programming languages says , doTask($var1) and doTask($var1, $var2) are ... Read More

In this article, we will learn about useful and important functions in PHP for file inclusion. All these functions require, require_once, include and include_once are utilized to include the files in the php page but there is a slight distinction among them in terms of functionality.Let's discuss these functions below with their functionality.include() :This function is used to include a file in a PHP page. If include() function is not able to find a specified file on location at that time it will throw a warning message however, it will not stop script execution.require():This function is utilized to add a ... Read More

In a PHP application, we are working with data in various formats such as string, array, objects or more...In a real-time application, we may need to read a php object result in the form of an associative array to get the desired output.So we will discuss here how to transform a php object to an associative array in PHP.Let's explain what is an object and associative array in PHP? An object is an instance of a class meaning that from one class you can create many objects. It is simply a specimen of a class and has memory allocated. While ... Read More

In PHP, testing floating point values for equality is problematic, because PHP is failing when checking if one floating point number is equal to another. Despite the fact floating point numbers seems to have the same value do not need to actually be identical. So in this article will demonstrate the problem we are facing in comparison of Floating-Point Numbers and different procedures to avoid this problem.ExampleLet's test this with a simple example:output:a and b are not same.Explanation:In this code, the else condition is executed instead of the if condition, even though $a and $b are the same. It is ... Read More