// Outer loop handles number of rows We will be using two loops, outer and inner loop. In this series, we're going to take a look at both structural and behavioral design patterns in PHP. This is a collection of known design patterns and some sample codes on how to implement them in PHP. Some problem patterns happen over and over again in a given context and Design Pattern provides a core of the solution in such a way that you can use the core solution every time but implementation should and may vary and the main reason behind that is we have the core solution and not the exact solution. $num = 8; // Print spaces Factory Method Design Pattern in PHP ... More info, diagrams and examples of the Factory Method design pattern you can find on our new partner resource Refactoring.Guru. It contains PHP examples for all classic GoF design patterns. { j = 2 The inner loop is always concerned with the number of elements in each line. // Print numbers // inner loop handles indentation // Outer loop handles number of rows Before we dig into the details of it, let us discuss some examples which will be solved by this particular Pattern. // go to new line after each row pattern is printed This is similar to the Star Half Pyramid, except that the stars are right-aligned. echo " "; PHP design patterns Design patterns help the programmer solve complex questions using methods developed and used by the computer science community for years. Inner loop iteration 1 –> j = 0 for($j = 0; $j < $i; $j++ ) Inner loop iteration 2 -> j = 1 { For this article, we would be using PHP to code the patterns. The ASCII value of A to Z is 65 to 90. Installation. } for($k = $num; $k > $i; $k-- ) for($k = $num; $k > $i; $k-- ) The factory method pattern is a creational design pattern which does exactly as it sounds: it's a class that acts as a factory of object instances.. for ($i = $num; $i > 0; $i--) This is because we print a single-space along with the stars as well. { ?>. // Outer loop handles number of rows In Laravel, the AuthManager class needs to create some secure elements to reuse with selected auth storage drivers such as cookie, session, or custom elements. ?>. // inner loop handles number of stars // The Lower Half Pattern Although, what can be changed is how we start the loops, increasing or decreasing order. //Call function and send number of lines as parameter for($j = 0; $j <= $i; $j++ ) for ($i = $num; $i > 0; $i--){ Print Star. $num = 5; The Singleton Design Pattern is a Creational pattern, whose objective is to create only one instance of a class and to provide only one global access point to that object. Remember, how we used double spacing to give a finished look to our pattern? else } Here we have discussed Overviews and Examples of Pattern in PHP with codes and output. The problem is tight coupling. print_pattern($num); Each pattern includes two examples: Conceptual examples show the internal structure of patterns, including detailed comments. echo " "; Hey, check out our new ebook on design patterns. To understand this concept, it's easiest to talk about a struggle that many developers go through in large systems. // Print stars This has been a guide to Patterns in PHP. // Outer loop handles number of rows // inner loop handles indentation Dive Into Design Patterns new. // Print stars This pattern is essentially a combination of Half pyramid and its mirror. // Outer loop handles number of rows A brief presentation on a handful of the more common and useful design patterns for OOPHP development. } echo " "; ' . echo "  "; echo "\n"; echo "  "; // inner loop handles number of stars So, for inverted patterns such as this, we know that the number of stars is more in the first line. { Code: '; } ?> Output: Inner loop iteration 1 –> j = 0 // go to new line after each row pattern is printed It’s all about keeping the code logic in mind. And so on. echo "\n"; 1 star in the first line, 2 stars in the second line and so on. // Print characters // go to new line after each row pattern is printed There is a lot to play with patterns. echo " "; A method called in one object will move up the chain of objects until one is found that can properly handle the call. // Print spaces for($j = 0; $j < $i; $j++ ) Starting with A, the subsequent rows would introduce a new alphabet sandwiched between the previous alphabets. Such Null object can also be used to provide default behaviour in case data is not available. } // inner loop handles indentation { Interviewers may ask questions based on creating patterns in PHP. The View acts as GUI, Model Acts as Back End and Control acts as an adapter. . { for($j = 0; $j <= $i; $j++ ) echo "\n"; This package provides a port of the code examples to PHP, so the design patterns taught in the book become easier to understand by PHP developers. Practice each example and understand how you can create patterns. This is how we control our inner loop based on the outer loops control variable. echo "* "; function print_pattern($num) The examples helped me to understand all the patterns, though better examples might exist. for($j = 0; $j < $i; $j++ ) Above Example implemented based on static method creation is getInstance(). Quote from Wikipedia: Software design pattern is a general, reusable solution to a commonly occurring problem within a given context in software design. I think the problem with patterns is that often people do know them but don’t know when to apply which. Facade is a part of Gang of Four design pattern and it is categorized under Structural design patterns. // Print spaces echo "\n"; } // Outer loop handles number of rows echo "* "; Next Page . ?>. } echo "\n"; For this number pattern, we will print the numbers in relation to the row number. 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