It is an art of programming to print some sort of pattern on the screen. Input number of rows and columns from user. As a rule of thumb, it's better to describe your regular expression patterns using single-quoted strings. This can be a series of numbers, letters, or special characters to form a pattern. This is a collection of known `design patterns`_ and some sample code how to implement them in PHP. Square in a Square . Introduction to Patterns in PHP. The triangle pieces are sewn to two opposite sides first, followed by the final two opposite sides resulting in another square … Function Description; preg_match() The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise. Program to print Triangle number in reverse pattern Output: 2. Using double-quoted strings, the interaction between PHP's and PCRE's interpretations of which bits of the string are escape sequences can get messy. The simplest example of a pattern is the Fibonacci series (1, 1, 2, 3, 5, 8, 13, 21, 34 and so on). Store it in a variable say rows and columns. A Computer Science portal for geeks. Simple Pyramid Pattern
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