Author: Awais Farooq

As in most of the object-oriented languages, you can define a constructor function in a class in PHP also. When you declare an object with the new operator, its member variables are not assigned any value. The constructor function is used to initialize every new object at the time of declaration. PHP also supports having…

The concept of classes and objects is central to PHP’s object-oriented programming methodology. A class is the template description of its objects. It includes the properties and functions that process the properties. An object is the instance of its class. It is characterized by the properties and functions defined in the class. Defining a Class in PHP To define…

We can imagine our universe made of different objects like sun, earth, moon etc. Similarly we can imagine our car made of different objects like wheel, steering, gear etc. Same way there is object oriented programming concepts which assume everything as an object and implement a software using different objects. Object Oriented Concepts Before we…

Windows command DIR and Linux command ls both display the list of files in the current directory. These commands can be operated with different switches to apply conditions on the list of files displayed. PHP provides a couple of options for programmatically listing files in a given directory. The readdir() Function The opendir() function in…

Computer files are stored in the local storage device (called drive) in a hierarchical order, where a directory contains one or more files as well as subdirectories. Respective DOS commands defined in operating systems Windows, Linux etc. are used to create and manage directories. PHP provides directory management functions to create a directory, change the current…

The concept of permissions is at the core of Unix/Linux file system. The permissions determine who can access a file and how one can access a file. File permissions in Linux are manipulated by the chmod command, which can be run inside the Linux terminal. PHP provides the chmod() function with which you can handle file permissions programmatically.…

Popular spreadsheet programs use the CSV file format (which stands for Comma Separated Values) to export worksheet data in plain text. Each line in the file represents one row of the worksheet, with values in each column separated by commas. PHP’s filesystem function library provides two functions – fgetcsv() and fputcsv() – respectively to read data from a CSV…

PHP doesn’t have either a delete keyword or a delete() function. Instead, it provides the unlink() function, which when called, deletes a file from the filesystem. It is similar to Unix/C unlink function. If the delete operation could not be completed, PHP returns false and shows an E_WARNING message. The mandatory string parameter to unlink() function is a string that refers…

In PHP, the fopen() function returns the file pointer of a file used in different opening modes such as “w” for write mode, “r” read mode and “r+” or “r+” mode for simultaneous read/write operation, and “a” mode that stands for append mode. When a file is opened with “w” mode parameter, it always opens…

You can copy an existing file to a new file in three different ways − Method 1 In the first approach, you can read each line from an existing file and write into a new file till the existing file reaches the end of file. In the following PHP script, an already existing file (hello.txt)…